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 . 探究与证明.
活动课上,老师让同学们以“正方形的折叠”为主题开展数学活动.
的边所在射线
上一动点,将正方形沿着
折叠,点A落在点F处,把纸片展平,射线
交射线
于点P.根据以上操作,试证明:
;
(2)【迁移探究】如图2,若正方形
边长为6,点E是
. 的中点,延长
交
于点Q,求线段
的长度;
(3)【拓展应用】如图3,点E是矩形
的边
上一动点,将矩形沿BE折叠,使点A落在点F处,射线
交射线
于点
.当
时,直接写出
的长.
活动课上,老师让同学们以“正方形的折叠”为主题开展数学活动.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5ba941c9328fab9e2c66cfb8578b29d.png)
(2)【迁移探究】如图2,若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
(3)【拓展应用】如图3,点E是矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a1186c90b2073d955c154079fd8a5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bea1ca74a4fad8392cc5d73cdf710b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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3 . 几何与探究
【初步感知】(1)如图1,在
中,
,
,将
沿
折叠,使点A与点B重合,折痕和
交于点E,
,求
的长;
【深入探究】(2)如图2,将矩形
沿着对角线
折叠,使点C落在
处,
交
于E,若
,
,求
的长;
【拓展延伸】(3)如图3,在矩形
中,
,
,点E为射线
上一个动点,把
沿直线
折叠,当点A的对应点F刚好落在线段
的垂直平分线上时,求
的长.
【初步感知】(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d32ad2221530be1dc6f86b9e73a04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【深入探究】(2)如图2,将矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0f0ccc8492a0ccf1eee24867060643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb262f3529a3e84959fe594b6628c77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
【拓展延伸】(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb262f3529a3e84959fe594b6628c77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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4 . 综合与实践
【问题初探】数学小组先以抛物线
为例,对函数图象的平移变换做了以下研究:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0757ca2a03cb7611104a9a840e84fa7c.png)
(1)k的值为____________,若
在抛物线
上,则平移后对应的点为
坐标为____________;
【探究归纳】同学们对函数图象向左平移1个单位,解析式中的x反而变为
产生了疑惑,这与点的坐标平移规律不一样,从而展开深入研究,以下是他们的部分相关研究笔记:
定义:函数图象按
平移是指沿x轴方向向右
平移h个单位或向左
平移
个单位;再沿y轴向上
平移k个单位或向下
平移
个单位.
设抛物线为
上的任意一点为
,将抛物线按
平移后,M的对应点
,
(2)若反比例函数
按
平移,求平移后的函数解析式;
(3)若抛物线按
平移,规定平移路径长为
.将抛物线
平移后交直线
于A,B两点,
,当平移路径最短时,求m,n的值.
【问题初探】数学小组先以抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0757ca2a03cb7611104a9a840e84fa7c.png)
(1)k的值为____________,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c981c1457633674b3a7b58d211032256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
【探究归纳】同学们对函数图象向左平移1个单位,解析式中的x反而变为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b5a9de8a72dda70e3eefeb0a408ffd.png)
定义:函数图象按
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d0c3b9f8438c1733e05b32c4d90e4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e8e2c7371b068c96d5ec34d134ac675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d082973139104a6023c0166de44b729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc453160e90d7b2196225110f6a72351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dce8b1c2ea5230fb9405fa6a064531e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9f7b8b78a4032d218c1d2d83d0890d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64752fba6f57f583d1220d1fc7d73b4.png)
设抛物线为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a8eb194c397afdb40737d432f87266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74415d7bd115454770f123ee207f637c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f9f4a300da9d5f26b32e5a141c9896c.png)
(2)若反比例函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f42b2a9736c8943106472a7398d2892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f45ba602e142644c6ad9f802b9ce4afd.png)
(3)若抛物线按
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b5e761af39bc1725915c3c9ee7febee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ea412665e3af61cb99cc3cd4764e60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aafae84e7fe39dc5b694c39405201d32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e6e15daf7b14dbff32c390f4984dcfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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5 . 几何探究
【课本再现】
(1)如图1,正方形
的对角线相交于点
,点
又是正方形
的一个顶点,而且这两个正方形的边长相等,边
与边
相交于点
,边
与边
相交于点
.在实验与探究中,小新发现无论正方形
绕点
怎样转动,
之间一直存在某种数量关系,小新发现通过证明
即可推导出来.请帮助小新完成下列问题:
①求证
;
②连接
,则
之间的数量关系是____________.
【类比迁移】
(2)如图2,矩形
的中心
是矩形
的一个顶点,
与边
相交于点
与边
相交于点
,连接
,矩形
可绕着点
旋转,猜想
之间的数量关系,并进行证明;
【拓展应用】
(3)如图3,在
中,
,直角
的顶点
在边
的中点处,它的两条边
和
分别与直线
相交于点
可绕着点
旋转,当
时,请直接写出线段
的长度.
【课本再现】
(1)如图1,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc526324e78e4d9226d1b537f27845a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b3791f7eb4d33d52bf7a73c1b3e75f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e045bc50398f2a1196c67a83a1b00b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8ef68028027c080166047e312fba12.png)
①求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0f79142caacc4d08942ffa23511f66.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e045bc50398f2a1196c67a83a1b00b5.png)
【类比迁移】
(2)如图2,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc526324e78e4d9226d1b537f27845a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d83d6bef3863e008fd27c52b9422e51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4635a4e561d862638f6818e85e74bfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e045bc50398f2a1196c67a83a1b00b5.png)
【拓展应用】
(3)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f76899b3a0bfbbdae7cb1148ad4bf018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a8daa1fe561e2aef00b5baa3fe45f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0512238dc25537ecef76e221e89382.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42779f180e18631a621c16da39d319ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
6 . 综合与实践
问题情境:“综合与实践”课上,老师将一副直角三角板摆放在直线
上(如图1,
,
,
,
).保持三角板EDC不动,老师将三角板
绕点C以每秒
的速度顺时针旋转,旋转时间为t秒,当
与射线
重合时停止旋转.各小组解决老师给出的问题,又提出新的数学问题,请你解决这些问题.
深入探究:
①老师提出,如图2,当
转到与
的角平分线重合时,
,当
在
内部的其他位置时,结论
是否依然成立?请说明理由.
②勤学小组提出:若
旋转至
的外部,
与
是否还存在如上数量关系?若存在,请说明理由;若不存在,请写出
与
的数量关系,并说明理由.
拓展提升:
③智慧小组提出:若
旋转到与射线
重合时停止旋转.在旋转过程中,直线
与直线
是否存在平行的位置关系?若存在,请直接写出t的值;若不存在,请说明理由.
问题情境:“综合与实践”课上,老师将一副直角三角板摆放在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95db05eddcfaddb6a9515d83231a025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703c0420c9c3055fb5cc03cd4e737b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/741a44528782580d24249e8075b8cd9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
深入探究:
①老师提出,如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a32b8c878d4162bfcb50cf6261ffa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a32b8c878d4162bfcb50cf6261ffa5.png)
②勤学小组提出:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1384d0a02d097ac7aa8a19e8da6f9767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9290b887e88e8d2fd774a7314e2ca73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b55b502f406c3525ce81b60bdfdc11e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9290b887e88e8d2fd774a7314e2ca73a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b55b502f406c3525ce81b60bdfdc11e.png)
拓展提升:
③智慧小组提出:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
2024-04-25更新
|
111次组卷
|
3卷引用:2024年广西壮族自治区百色市田阳区九年级中考二模数学试题
名校
7 . (1)证明推断:如图1,在正方形
中,点E,Q分别在边
上,
于点O,点G,F分别在边
上,
,求证:
;
(2)类比探究:如图2,在矩形
中,
,将矩形
沿
折叠,使点A落在
边上的点E处,得到四边形
,
交
于点H,连接
交
于点O,试探究
与
之间的数量关系,并说明理由;
(3)拓展应用:在(2)的条件下,连接
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8681dc7b0483bb527802389b03129b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70daa268c7a0b17f39c1e6eba043a3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28bbdea60708bebc259452cc5e07ea5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f7b05f1f0d9dfcd37da1e437861aae6.png)
(2)类比探究:如图2,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/483e5e695460e1752a7f9b0ee3f0b6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19191ca20cae3123d7df1b3a2ec5a857.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)拓展应用:在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/313487069c46cb24487d6a48c0cc589a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56a2e0b739038c0e756aa511920fa300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次
8 . 已知
,点
在
上,点
在
上,点
为射线
上一点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/a204534b-1faf-44d8-b988-c4d867a51426.png?resizew=365)
(1)(基础问题)如图1,试说明:
.(完成图中的填空部分)
证明:过点
作直线
,
又
,
,
,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
___________
.
(2)(类比探究)如图2,当点
在线段
延长线上时,直接写出
、
、
三者之间的数量关系.
(3)(应用拓展)如图3,
平分
,
交
于点
,且
,
,
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/1/a204534b-1faf-44d8-b988-c4d867a51426.png?resizew=365)
(1)(基础问题)如图1,试说明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e758277b8dd10d1ae128f6dd1102960.png)
证明:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31307b00524e461b0ad8dfbcdf24bacf.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffe9353e99abfcf4048066770298aea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3c7e3ec1cbfe2b1f1879f85a95e90c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6200ee85c6a6869b0d422a2a1beece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73c256acb5e374fef82ea9653322821.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea0bc1c09a947db8e6ed959a22909c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b344dc3b035a370036de4f14777da0.png)
(2)(类比探究)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7d74465c34ad7afa5d39d9e300bdf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c543c3ddc3723fde6bbfca3ea3b921b.png)
(3)(应用拓展)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f31dac46d98b34afe54fa9cc085ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea718690917f8c929c11c089ad2dc2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fb22e8003b0950e9118783d303e451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec6b53bde5d8d7c91b51bfa6a5811f70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432e5b3363cee002dc04ced784ea6197.png)
您最近一年使用:0次
名校
9 . 综合与实践:
问题背景:数学小组发现国旗上五角星的五个角都是顶角为的等腰三角形,对此三角形产生了极大兴趣并展开探究.
探究发现:如图1,在中,
,
.
(1)操作发现:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
①______
;
②设,则
______(用含
的式子表示);
(2)进一步探究发现:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5156adc8c4bbbebb15d992a26a529484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5156adc8c4bbbebb15d992a26a529484.png)
(3)拓展应用:当等腰三角形的底与腰的比等于黄金比时,这个三角形叫黄金三角形.
如图1中的是黄金三角形.
如图2,在菱形中,
,
,求菱形较长对角线的长.
您最近一年使用:0次
10 . 问题背景:如图1,在四边形
中,
,
,探究线段
、
、
之间的数量关系.
小杨同学探究此问题的思路是:将
绕点D逆时针旋转
到
处,点A、C分别落在点B、N处(如图2),
,
;因为在四边形
中,
,所以
,所以
,点C、B、N在同一条直线上;易证
是等腰直角三角形,所以
,从而得出结论:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/cbb1df86-4624-4a7c-b062-98eed63bcdf5.png?resizew=632)
简单应用:利用已学知识和小杨得出的结论,解决以下问题:
(1)如图1,
,
,若
,
,求
的长;
(2)如图3,已知
是
的直径,点C、D在
上,
.求证:
;
拓展延伸:
(3)如图4,
,
,
是四边形
的外接圆,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
小杨同学探究此问题的思路是:将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/648a7f59e7b195c53fcbdaa0ff5d3f78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3b378b9bac0d99ea81a6f41d0bc16f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed294a38f8c433f1f27e2e2bb74c905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c593ebdb2f1934a0cb56f8c44f454f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/191e2085abd1720626d02d4fc25f2fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d386b16449a03dfda884efc9bd68c487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce2fac8910249a25376a455fb48f55bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/952cc1d92a41d411de1760c6113d5d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1227dc5c96ba08a15cb9583224eeaf1a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/cbb1df86-4624-4a7c-b062-98eed63bcdf5.png?resizew=632)
简单应用:利用已学知识和小杨得出的结论,解决以下问题:
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)如图3,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b997b0da1c9338e640206bfc0d0a427a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1227dc5c96ba08a15cb9583224eeaf1a.png)
拓展延伸:
(3)如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8790a77bc3cbd12eb4c6eda8ead03a30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcf05aaa351239448a9ab0e048f76faf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de006cef9e5efbcbf74229845804650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次