1 . 阅读与思考:
问题背景:在数轴上,点A表示数a,点B表示数b,若点C是AB的中点,则点C表示的数是
.
【尝试应用】(1)如图,已知
,
,
,
.设线段
的中点为M,则M的坐标可以这样计算:M的横坐标等于
,M的纵坐标等于
,即
,设
的中点为N,则N的横坐标等于
,N的纵坐标等于
,即
,分别找到线段
和
中点
、
,然后写出它们的坐标,则
______,
______.
,
,则线段的中点坐标为______.
②若点
,
,用我们发现的结论可以直接得到线段PQ的中点坐标为__________.
【拓展探索】(3)已知两点
,
,直接写出线段EF的三等分点的坐标.
问题背景:在数轴上,点A表示数a,点B表示数b,若点C是AB的中点,则点C表示的数是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f89a8b5cf6996a6455375e405bfb9d.png)
【尝试应用】(1)如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6d9a25d20b86c2583f6c071091e8e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6f3aec1dc12dc085258842c804e597b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9f0bc0ceefba89d76aed7d16f9f287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be94b98e86667025c7bc8376c3c19737.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d0878e90213abd9814631b0f361f45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20616ebceeaf7061bd9dc6b59be9b7ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b9ae3974672b0ab9b2894ca06a53ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70cebf96cfdec2ba41b8fe713227d585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b5ba2431f32cebb5e2e3d26ad5adac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d6da3d1b61ea676db605d8d75185bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2693f047cefe8477d055076b0fb25a03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/590a7d430703d2d41a0171ff6a97dac5.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcbae1f0dcc2e261da7e4c7a595286cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7edb354c3d47708806bd721642418b.png)
【拓展探索】(3)已知两点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eacbf21e62770e616be5bdf6a2df4c3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b7b1855db91241431efe644f9e8282.png)
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2 . 配方法是将一个式子的某一部分通过恒等变形转化为完全平方式的形式.此法常被用到代数式的变形中,并结合非负数的意义来解决一些问题.
我们定义:一个整数能表示成
(a、b是整数)的形式,则称这个数为“完美数”.例如,5是“完美数”,理由:因为
,所以5是“完美数”.
解决问题:(1)①29是“完美数”,请将它写成
(a、b是整数)的形式___________;
②若
可配方成
(m、n为常数),则
___________;
探究问题:(2)①已知
,则
___________;
②已知
(x、y是整数,k是常数),要使S为“完美数”,试写出符合条件的一个k值___________
拓展结论:(3)已知实数x、y满足
,求
的最值,并求出此时x的值.
我们定义:一个整数能表示成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0f7368432b977563895c2d28862766.png)
解决问题:(1)①29是“完美数”,请将它写成
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c925be255ca736a53b24d13ddede1a86.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178d0ab9417a5f9ad9d2cd324612d642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855c1b3733e046c292c4e166954ef216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549f99e6e10e61af2e7734c4d01ea90c.png)
探究问题:(2)①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af860678725c6ea1c72d33416d436fde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65bec55c3826d2d5adee734c2ce790c.png)
拓展结论:(3)已知实数x、y满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcade0ecb508f1837209cdd4c75fc12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61e3da18d31497e7c2ce5217d139f80e.png)
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3 . 综合与实践
在学习了“特殊平行四边形”后,兴趣小组的同学发现了这样一个问题:如图1,已知正方形
,
为对角线
上一动点,过点
作垂直于
的射线
,点
在射线
上,且
,连接
.通过观察图形,直接写出
与
的数量关系: .
(2)【类比探究】
兴趣小组的同学在探究了正方形中的结论后,将正方形换成矩形继续探究.如图2,已知矩形
,
,
,
为对角线
上一动点,过点
作垂直于
的射线
,点
在射线
上,且
,连接
.请判断线段
与
的数量关系,并说明理由.
(3)【拓展应用】
在(2)的条件下,点
在对角线
上运动,当四边形
为轴对称图形时,请直接写出线段
的长: .
在学习了“特殊平行四边形”后,兴趣小组的同学发现了这样一个问题:如图1,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6218fe7c62cd2dd2b7c70b8f91a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
(2)【类比探究】
兴趣小组的同学在探究了正方形中的结论后,将正方形换成矩形继续探究.如图2,已知矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4630b9ca3d20635161fa8fbf812b9128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26ad70d2b3aac8604834d57dfc59bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f6218fe7c62cd2dd2b7c70b8f91a61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)【拓展应用】
在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49404e6b19a342401a80d9feb1144605.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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4 . (1)【模型探究】把两个全等的矩形
和矩形
拼成如图1的图案,则
;
(2)【迁移应用】如图2,在正方形
中,E是
边上一点(不与点C、D重合),连接
,将
绕点E顺时针旋转
至FE,作射线
交
的延长线于点G,求证:
;
(3)【拓展延伸】在菱形
中,
,E是
边上一点(不与点C、D重合),连接
,将
绕点E顺时针旋转
至
,作射线
交
的延长线于点G.
①探究线段
与
的数量关系,并说明理由;
②若
,当
最小时,
的面积为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1f13007c6d134c50004c62dc240707.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e218b2c53118f0fffac43fbde097f00e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)【迁移应用】如图2,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c49a8ba3024d05511eed8c96d3a68f3.png)
(3)【拓展延伸】在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284a563413dc0532138fb2a64db8cc2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d00be47dcb89793f14a2fd10f4c522b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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5 . 问题提出
如图1,点
是等腰
底边
上一点, 点
,
在
同侧,且
,
,取
的中点
, 连接并延长
,
交于点
,探究
与
的数量关系.
(1) 先将问题特殊化, 如图
,当
时,直接写出
与
的数量关系;
(2)再探究一般情形.如图1,证明(1)中的结论是否仍然成立.
问题拓展:
(3)如图
,
不是等腰三角形, 点
是
边上的点, 连接
,
, 已知
于
,
, 且
,直接写出
的值.
如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7197b9c49f0585f548621a771d5b7bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57234018370c5f07523fb3c918eebf20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/971b23e3ee827018557d6c88edd5369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
(1) 先将问题特殊化, 如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed5034a973110e2a6eb2e7d5699c24f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
(2)再探究一般情形.如图1,证明(1)中的结论是否仍然成立.
问题拓展:
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365822bd3945e6a3e871ca979c84cc12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d260c4df7b0dc180af6980d21f3371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d223fd53549f2533a3cf914d399c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97bac88bb6ad658f5a896c3204086b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25990a4258e7d2e45aeec37622063b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61f9215613b7b05217ed77268c238391.png)
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6 . 综合与实践
问题背景:
小明在研究直角三角板时,发现含有
的直角三角板具有一些特殊性质,于是他做出了如下探究.
初步发现:
如图①,在
中,
,
,作
的垂直平分线
交
于点D,交
于点E,连接
,则
______
,线段
,
,
的数量关系是________________;
事实上,在含
的直角三角形中,两个锐角恰好是2倍关系,而对于任意一个三角形,若有两个角存在2倍关系,这样的三角形还能具有上面发现的结论吗?带着这个疑问,小明又研究了下面一个三角形,请结合小明的发现,一起探究一下吧.
如图②,在
中,
,
,
,作
交
于点D.
;
(2)求
的面积;
拓展应用:
像这样的三角形,我们不妨称之为“倍半角三角形”.如图③,在菱形
中,
,
,
是对角线,点E,F分别在
,
上,且
.
,
,用含x的代数式表示y;
问题背景:
小明在研究直角三角板时,发现含有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
初步发现:
如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db90c0feb35aa54464f1303be9118f37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
事实上,在含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83da4fc72ea219e514566d4c190b6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9060f03b9ee41d70d135b1e1a8902ce9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3361ca593cd2159bf8f8545a30d3dde.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
拓展应用:
像这样的三角形,我们不妨称之为“倍半角三角形”.如图③,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0ce914a50f5376766d5065e5f13d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6618b4d41917e695da2356c016242ba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c30f73c718bde8352055a14987fc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b290efb9f94c6d30cffb5973a78d9ec.png)
您最近一年使用:0次
7 . 综合与实践
性质探究:如图(1),在等腰三角形中,则底边
与腰
的长度之比为
,则
.
理解运用:
(1)若等腰三角形底边与腰的比为,周长为
,则它的面积为________;
(2)如图(2),在四边形中,
.在边
,
上分别取中点
,
,连接
,若
,
,求
的度数.
迁移拓展:
(3)如图(3),点将线段
分成两部分,较长线段为
,如果
,这个比值叫黄金比,称点
为线段
的黄金分割点.在求黄金比时,通常设整个线段的长为单位
,较长线段的长为
,利用定义即可求出黄金比.
进一步探究发现:①当等腰三角形的底与腰的比等于黄金比,②腰与底的比是黄金比,满足以上两种情况之一的三角形叫做黄金三角形,设黄金三角形顶角的角度为,请你利用所学知识,选择其中一种画出图形,求
的值.
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8 . 已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,点
在
上,点
在
上,点
为射线
上一点.
,试说明:
.
完成下面的填空部分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
证明:过点
作直线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c1d3cb2a4c9065eabd1e13ff5ac843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
① ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f6803ba20fde927faeaef0253d99de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
②
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f6803ba20fde927faeaef0253d99de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
,
③
④
.
.
(2)【类比探究】如图
,当点
在线段
延长线上时,请写出
、
、
三者之间的数量关系,并说明理由.
(3)【应用拓展】如图
,点
与点
重合,
平分
,且
,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cdd9f345915ae742ed3dcd3f9678264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e60e8be62b1a0acf42e6dcb66c3806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c1d3cb2a4c9065eabd1e13ff5ac843.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f6803ba20fde927faeaef0253d99de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a3e6ac0da6f3318164ee76c17bc3e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f6803ba20fde927faeaef0253d99de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8a6cb3bfd29970e23c89d6a625bfcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9f99dcbe6a00219145ed5af583eeae.png)
(2)【类比探究】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7712a762b12e6541643015305287a0b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f2e07c7d33985d4b447f87cabe16cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e1db385f16ebb7fa24bd8f1b36978b.png)
(3)【应用拓展】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61182c456ed7b68095a762967ae47744.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9dbef09186b2895cce40f9803f62291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392107c4d0f3ae377dc4a32ba3f0a0d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98b198b39891ef5b838556491fec47b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31772e84bba4cbf75e376e5a49fc8f5e.png)
您最近一年使用:0次
2024七年级下·全国·专题练习
9 . 【探究】如图①,
和
的平分线交于点
,
经过点
且平行于
,分别与
、
交于点
、
.
(1)若
,
,则
度,
度.
(2)若
,求
的度数.
【拓展】如图②,
和
的平分线交于点
,
经过点
且平行于
,分别与
、
交于点
、
.若
,直接写出
的度数.(用含
的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e5fa6b13329549b1d7eb94b637d4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f303bb165797a9a868e79723bf0f302d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca21ffc584ae2b3dc79040cbec5a3b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26451df635403d0ace98756a0d85e1c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08991e33572d0a7a830db8de33b88fe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ed175720e86a9776bff2f198ba242b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03f45d4aa794f666a8c6e7742ff79d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9023ec6cf6eab5d6b70dde00d1ddeba0.png)
【拓展】如图②,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e5fa6b13329549b1d7eb94b637d4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffdb0d716fd724249fc506c4419b91c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15406a319ef84dff1869b20941f057a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9023ec6cf6eab5d6b70dde00d1ddeba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
7日内更新
|
162次组卷
|
3卷引用:专题01 相交线与平行线全章复习攻略(考点清单,5个概念2个判定2个性质2种方法2种思想专练)-2023-2024学年七年级数学下学期期末考点大串讲(人教版)
(已下线)专题01 相交线与平行线全章复习攻略(考点清单,5个概念2个判定2个性质2种方法2种思想专练)-2023-2024学年七年级数学下学期期末考点大串讲(人教版)(已下线)第2章相交线与平行线 全章高频考点专练(4个概念2个判定2个性质2个方法2种思想专练)原卷版(已下线)清单01 平面图形的认识(二)全章复习(2个考点梳理+12种题型解读)-2023-2024学年七年级数学下学期期末考点大串讲(苏科版)
2024七年级下·上海·专题练习
10 . (1)观察理解:如图1,
中,
,
,直线
过点
,点
,
在直线
同侧,
,
,垂足分别为
,
,由此可得:
,所以
,又因为
,所以
,所以
,又因为
,所以
( );(请填写全等判定的方法)
(2)理解应用:如图2,
,且
,
,且
,利用(1)中的结论,请按照图中所标注的数据计算图中实线所围成的图形的面积
;
(3)类比探究:如图3,
中,
,
,将斜边
绕点
逆时针旋转
至
,连接
,求△
的面积.
(4)拓展提升:如图4,等边
中,
,点
在
上,且
,动点
从点
沿射线
以
速度运动,连接
,将线段
绕点
逆时针旋转
得到线段
.设点
运动的时间为
秒.
①当
秒时,
;
②当
秒时,
;
③当
秒时,点
恰好落在射线
上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb0a2d7d40a6c0bf1fddb802db381689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e77a906a317863df81327e97ae0d5e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3f0ca8685431a5114a4b9288e6f93bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b2b6f11b74b1cb04d9ed8fe485687e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dfc52a6655c83c8c7eb081bd0f26e52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e72d812fdaca589976ea299cc7468.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bb8ea50bada11e6bf218e0de63bf515.png)
(2)理解应用:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be5fc6ead6416492c231c320a5486f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
(3)类比探究:如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdfb59c34fca7218f73821e5c31d1df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3568dd80dbfabbd56643668dc4b764.png)
(4)拓展提升:如图4,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/516eab2f2b97c8f2931321e285ffabb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be25dd5a289b24fa89d9939ef0ff864f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6485afddd0b6fe46abc1d0a3268b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e6ec24d3d67bf4592313b6b3f4f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b561e63043cd4c4e2e295d817e83ac0.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f4a6920a0dc269d5d1781e87fe84f1.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
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3卷引用:上海市七年级下学期期末必刷压轴60题(14个考点专练)-2023-2024学年七年级数学下学期期末考点大串讲(沪教版)
(已下线)上海市七年级下学期期末必刷压轴60题(14个考点专练)-2023-2024学年七年级数学下学期期末考点大串讲(沪教版)(已下线)专题09期末解答题压轴题(1大题型)【好题汇编】-备战2023-2024学年七年级数学下学期期末真题分类汇编(上海专用)(已下线)专题03 三角形(考题猜想,易错、好题精选11个考点60题专练)-2023-2024学年七年级数学下学期期末考点大串讲(沪教版)