已知平行四边形
位置在平面直角坐标系中如图1所示,
,且
,
.
(2)动点
从点
出发,以每秒1个单位的速度沿线段
以向终点
运动,动点
从点
出发以每秒2个单位的速度沿射线
运动,两点同时出发,当
到达终点时,点
停止运动,在运动过程中,过点
作
交射线
于
(如图
.设
,运动时间为
,求
与
的函数关系式,并直接写出自变量的取值范围;
(3)在(2)的条件下,作点
关于直线
的对称点
(如图
,当
时,求运动时间
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ca0f2b2b40440365fcce22ac32c0ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/434845564fd5765244f8d1aa9240fa39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26ea9e9e42ced4f9b7540b368fbd171.png)
(2)动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06629c80dac51366d8f4ef82236f7db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad217e26bd3580c35998109de14cef73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73acea427b01ad4585050df4c85fca80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ebd1d359040a1172a944ded96ed0127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2324a65e345753fdd1db2354bfb0ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b78d83d11ab94a2f8116d2d34f337e9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
14-15八年级下·黑龙江哈尔滨·期末 查看更多[2]
更新时间:2016-12-06 02:54:31
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相似题推荐
解答题-问答题
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名校
【推荐1】定义:我们将
与
称为一对“对偶式”.因为
,可以有效的去掉根号,所以有一些题可以通过构造“对偶式”来解决.
例如:已知
,求
的值,可以这样解答:
因为
,所以
.
(1)已知:
,求:
①
;
②结合已知条件和第①问的结果,解方程:
;
(2)代数式
中
的取值范围是 ;
(3)计算:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9928ba39cdd5878aced506d3dbb9fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b87033f1efe85e559a9a3efc985be9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50036f42d68bcb48ee54bf6a8e76856f.png)
例如:已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2127aba1dbdcc5d8371164dc892e592b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385eceb4c18ff894906f9c0ff2e2a7fe.png)
因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/995f4908dce29b7494b211fa44301057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad9b9a7c8bdab531e18b8a634cefcce.png)
(1)已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0280e20519448e760b000934efaae930.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cf01fb27d9b1a8385b2809d19fe1155.png)
②结合已知条件和第①问的结果,解方程:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0280e20519448e760b000934efaae930.png)
(2)代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/859dfd63c45e5e12cc4e1fe75f8359d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6292eb3682a047db05748598efd3558.png)
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【推荐2】综合与实践:在学习二次根式时,发现一些含有根号的式子可以结合完全平方式化成另一个式子的平方,如:
,
.
由此,可将一些被开方数为无理数的式子进行化简
,
.
(1)请你依上述方法将
化成一个式子的平方,并直接写出
的值.
(2)化简:
.
(3)若
且
、
、
均为正整数,则
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e79a1f299df90c3c5c86fe840c6050c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0fdf65f3fe4679262ccb78542a4181.png)
由此,可将一些被开方数为无理数的式子进行化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e120084c4813b62031639a0ecb7dd0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7cb0a928f190a7ed7a04b33ac6568b4.png)
(1)请你依上述方法将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4324f8b8e4f3dac696bd32eb8e28db42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f985ec35b18326e1ccd843dd9031942f.png)
(2)化简:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17b1d9ff3a7274818940c61a4dc25e24.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d1b5eb3d5b87129492eb704a6cf4e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
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解题方法
【推荐1】阅读材料:如图所示,将两个含
角的三角尺摆放在一起,可以证得
是等边三角形,于是我们得到:在直角三角形中,如果一个锐角等于
,那么它所对的直角边等于斜边的一半.即“在
中,
,
,则
” .
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559906562048/2651025540128768/STEM/470b32558f2549dbadbcc5c06fca4b54.png?resizew=145)
你可以利用以上这个结论解决问题.
(1)如图①,
平分
,点
在射线
上,
,
,垂足分别是点
、
,若
,请直接写出
的长;
(2)如图②,在
中,
,
、
分别是
、
的平分线,
、
相交于点
,求证:
;
(3)如图③,在
中,
,
、
的角平分线相交于点
,把三角板上
的顶点放在点
处,角的两边分别与边
、
相交于点
、
,连结
、
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559906562048/2651025540128768/STEM/470b32558f2549dbadbcc5c06fca4b54.png?resizew=145)
你可以利用以上这个结论解决问题.
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3ededa0e19291b5b7eb9884af5bdeb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9887e1ff61308713287d592c8e8d942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2f8849c0723ee8b7651f9574b39758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70ac03e0b1559d3a64fefe22b807f6f2.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302efd5266f7868d8c67f7bb09dc2ddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faffe3765c15f53305516895aa595a9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc96cbcfa8d5e19732facffb936bec5c.png)
![](https://img.xkw.com/dksih/QBM/2021/1/26/2644559906562048/2651025540128768/STEM/1a6ba8e5-e9b1-4b27-8a23-f7897b03a67b.png)
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【推荐2】如图1,把一个含
角的直角三角板
和一个正方形
摆放在一起,使三角板的直角顶点和正方形的顶点
重合,点
、
分别在正方形的边
、
上,连接
,取
中点
,
的中点
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2023/3/25/3201754939826176/3203766373007360/STEM/c5af1abae21b4f698978e6ff896579cc.png?resizew=418)
(1)如图1,连接
,求证:
;
(2)在(1)的条件下,请判断线段
与
之间的数量关系,并加以证明;
(3)如图2,将这个含
角的直角三角板
的直角顶点和正方形的顶点
重合,点
、
分别在正方形的边
、
的延长线上,其他条件不变,当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f636f76d550dfb593a25eb680cff556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2023/3/25/3201754939826176/3203766373007360/STEM/c5af1abae21b4f698978e6ff896579cc.png?resizew=418)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
(2)在(1)的条件下,请判断线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(3)如图2,将这个含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f636f76d550dfb593a25eb680cff556.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
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【推荐3】综合与实践
问题情境:数学课上,同学们以等腰直角三角形为背景探究图形变化中的数学问题.如图1,将两张等腰直角三角形纸片重叠摆放在桌面,其中
,
,
,点
,
在
的同侧,点
,
在线段
上,连接
并延长
交
于点
,已知
.将
从图1中的位置开始,绕点
顺时针旋转(
保持不动),旋转角为
.
数学思考:(1)“求索小组”的同学发现图1中
,请证明这个结论;
操作探究:(2)如图2,当
时,“笃行小组”的同学连接线段
,
.
请从下面A,B两题中任选一题作答.我选择________题.
A.①猜想
,
满足的数量关系,并说明理由;
②若
,请直接写出
时,
,
两点间的距离;
B.①猜想
,
满足的位置关系,并说明理由;
②若
,请直接写出点
落在
延长线时,
,
两点间的距离.
问题情境:数学课上,同学们以等腰直角三角形为背景探究图形变化中的数学问题.如图1,将两张等腰直角三角形纸片重叠摆放在桌面,其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65633001f2eecfee015749ffb6fa4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faabc484ce3666706c1beffda4bcfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c2141a1c95082eeee79005b8b463d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
数学思考:(1)“求索小组”的同学发现图1中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
操作探究:(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e915c7310f3781887a1afb99dbf949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
请从下面A,B两题中任选一题作答.我选择________题.
A.①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0421fa99d2b9b719c26728357df78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
B.①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c0421fa99d2b9b719c26728357df78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/6/30/2754074437173248/2773146286637056/STEM/7c6cde1c-9d89-4435-8d0b-a00d3cc74555.png)
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【推荐1】如图,在直角坐标系中,
,
,一次函数
的图象与x轴交于A点.
(2)一次函数图象上是否存在一点C,使得四边形
是平行四边形?如存在,求出C点坐标.若不存在,说明理由;
(3)将
绕点O顺时针旋转,旋转得
,问:能否使以点O、
、D、
为顶点的四边形是平行四边形?若能,求点
的坐标;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88b94bb9e760df0200068e5c62b16af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487297f8f781bc6f38fa49546ca0ea17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21114b1e17fe75cf136c3fcc2ceff9be.png)
(2)一次函数图象上是否存在一点C,使得四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7dc2fe5d920e74d0941b8c1db9ec04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
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【推荐2】如图,抛物线y=ax2+bx+6经过点A(﹣2,0),B(4,0)两点,与y轴交于点C,设点D的横坐标为m(1<m<4).连接AC、BC、DB、DC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/47711563-a7bf-4584-ac9c-3d4a1424810e.png?resizew=306)
(1)求抛物线的函数表达式;
(2)当△BCD的面积等于△AOC的面积时,求m的值;
(3)当m=3时,若点M是x轴正半轴上的一个动点,点N是抛物线上一动点,试判断是否存在这样的点M,使得以点B、D、M、N为顶点的四边形是平行四边形?若存在,请直接写出点M的坐标,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/47711563-a7bf-4584-ac9c-3d4a1424810e.png?resizew=306)
(1)求抛物线的函数表达式;
(2)当△BCD的面积等于△AOC的面积时,求m的值;
(3)当m=3时,若点M是x轴正半轴上的一个动点,点N是抛物线上一动点,试判断是否存在这样的点M,使得以点B、D、M、N为顶点的四边形是平行四边形?若存在,请直接写出点M的坐标,若不存在,请说明理由.
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解答题-作图题
|
较难
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【推荐3】问题背景:我们已经学过平行四边形、矩形、菱形、正方形等特殊的四边形,大家对它们的性质非常熟悉.在我们身边还有一种特殊的四边形--等邻边四边形,即:有组邻边相等的凸四边形叫做“等邻边四边形”.
的顶点
在网格格点上,请你在
的网格中分别画出3个不同形状的等邻边四边形
要求顶点
在网格格点上.
(2)如图2,在平行四边形
中,
是
上一点,
是
上一点,
,
,请说明四边形
是“等邻边四边形”;
(3)如图3,在矩形
中,
平分
,交
于点
,
,
,
是线段
上一点,当四边形
是“等邻边四边形”时,请直接写出
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd557c3ac7908fe535f678a50361b820.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)如图2,在平行四边形
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b34233772c4c26d6669499d9b1f15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4908c742e58c66ed0feb53a29b0dc20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(3)如图3,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adc90c2d45477e166b02359525f40aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图.
,点O在
上,
与
相切于点A,与
的交点分别为B,C.作
,与
交于点D,作
,垂足为E,连接
并延长,交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/1337e6dc-1870-4b8a-8b46-98723e4d2439.png?resizew=188)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f21711944d2f4afad781c594dcdbc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aef06f9e1568da85546e7ecda026b53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca524c19ba748c9be22d99c8629ea72a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/1337e6dc-1870-4b8a-8b46-98723e4d2439.png?resizew=188)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746e29f76856ecc02542965d41302542.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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(0.4)
解题方法
【推荐2】在平面直角坐标系中,点
,直线
轴.在矩形
中,
,
.以点
在第一象限内直线
上时为初始位置,将矩形
以点
为中心逆时针旋转,旋转角为
.直线
,直线
分别与直线
相交于点
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740598113886208/2744087848501248/STEM/200be628-26c8-42f1-8677-08c2ca7959fb.png)
(1)如图1,当顶点
落在直线
上时(此时点
与点
重合).
①求证:
;
②求点
的横坐标;
(2)如图2,当顶点
落在
轴正半轴上时,请直接写出点
的横坐标;
(3)在矩形
旋转过程中,当
时,若
,请直接写出此时点
的横坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc878a5fd7b508cf817cbb65d3940547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de68db2706156f1ee17e24f843b40cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87d89b3eb0c40885f5a6f011d9171b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcd3fd00798e7ec50afafe7fa7a4f42e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863544b6162ca5c8bc38ade2fc28f8a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87d89b3eb0c40885f5a6f011d9171b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/11/2740598113886208/2744087848501248/STEM/200be628-26c8-42f1-8677-08c2ca7959fb.png)
(1)如图1,当顶点
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fcf7b51c2eefe1a71214e3456858231.png)
②求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(2)如图2,当顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
(3)在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f87d89b3eb0c40885f5a6f011d9171b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ece6304de594fc096b6ee189038fd4e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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