如图,在
中,
、
的平分线交于点D,延长
交
于E,G、F分别在
上,连接
,其中
,
.
时,求
的度数;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3867f437221f10647b2f5e1b18e4cbd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea54719168480cfe9a97707e266bd88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5a00e4cfa353faf4d02c13af3b3808.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b57a2e4e2a833a18e9bb0945cd3ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836ea820cf3732508cdd332ceb9395ce.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91719e62ac919f8c92035ba224590ddb.png)
更新时间:2024-05-21 19:07:30
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【推荐1】(1)如图,△ABC中,∠ABC的角平分线与∠ACB的外角∠ACD的平分线交于A1. 当∠A为80°时,则∠A1 = °.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189229613801472/2191019211718657/STEM/14c4b59db6104c63a148c8e036d3a090.png?resizew=190)
(2)在上一题中,若∠A1BC的角平分线与∠A1CD的角平分线交于A2,∠A2BC与A2CD的平分线交于A3,如此继续下去可得A4、…、An,则∠A6= .
(3)如图,四边形ABCD中,∠F为∠ABC的角平分线及外角∠DCE的平分线所在的直线构成的角,若∠A+∠D=230度,则∠F=
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189229613801472/2191019211718657/STEM/4ad78eb977954d42a3ac144b21e75aaa.png?resizew=173)
(4)如图,△ABC中,∠ABC的角平分线与∠ACB的外角∠ACD的平分线交于A1若E为BA延长线上一动点,连EC,∠AEC与∠ACE的角平分线交于Q,当E滑动时有下面两个结论:①∠Q+∠A1的值为定值;②∠Q —∠A1的值为定值.其中有且只有一个是正确的,请写出正确的结论 (填编号),并求出其值.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189229613801472/2191019211718657/STEM/14c4b59db6104c63a148c8e036d3a090.png?resizew=190)
(2)在上一题中,若∠A1BC的角平分线与∠A1CD的角平分线交于A2,∠A2BC与A2CD的平分线交于A3,如此继续下去可得A4、…、An,则∠A6= .
(3)如图,四边形ABCD中,∠F为∠ABC的角平分线及外角∠DCE的平分线所在的直线构成的角,若∠A+∠D=230度,则∠F=
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189229613801472/2191019211718657/STEM/4ad78eb977954d42a3ac144b21e75aaa.png?resizew=173)
(4)如图,△ABC中,∠ABC的角平分线与∠ACB的外角∠ACD的平分线交于A1若E为BA延长线上一动点,连EC,∠AEC与∠ACE的角平分线交于Q,当E滑动时有下面两个结论:①∠Q+∠A1的值为定值;②∠Q —∠A1的值为定值.其中有且只有一个是正确的,请写出正确的结论 (填编号),并求出其值.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189229613801472/2191019211718657/STEM/e0b293877ed9430e97344a97ca5e63ec.png?resizew=199)
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【推荐2】在平面直角坐标系中,已知
,且满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/d7e7d5c6-1269-485c-826e-48085010a7f8.png?resizew=396)
(1)写出
两点的坐标;
(2)如图1,已知坐标轴上有两个动点
同时出发,
点从
点出发沿
轴负方向以每秒1个单位长度的速度移动,
点从
点出发以每秒3个单位长度的速度沿
轴正方向移动,点
为线段
上一点.设运动时间为
秒.问:是否存在这样的
,使
?若存在,请求出
的值;若不存在,请说明理由.
(3)如图2,点
是第二象限上的点,连
,点
是线段
上一点,满足
.点
是射线
上一动点,连
,交直线
于点
,当点
在射线
上运动的过程中,求
与
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8623c63099734fcf3054a0ca9712bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c47c0748a6a48c565e8d6346303dc14c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/d7e7d5c6-1269-485c-826e-48085010a7f8.png?resizew=396)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(2)如图1,已知坐标轴上有两个动点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b1b15a4605fce993cb13aefbf40360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43c2df1ec4f5d17fa8590e920fac61af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ebd1d359040a1172a944ded96ed0127.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b80edf4c6642c5cc9fd14597898718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/440eb5e793336330662561bc5b17e65b.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/66ea8128187ccc434c68cc9eb393b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feaf8ceca9b6ecd615e91bbe0af84e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a3d419c619743fa7b7eaedd1838efb.png)
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【推荐1】如图,在
中,
平分
.
(1)若
为线段
上的一个点,过点
作
交线段
的延长线于点
.
①若
,
,则
_______
;
②猜想
与
、
之间的数量关系,并给出证明.
(2)若
在线段
的延长线上,过点
作
交直线
于点
,请你直接写出
与
、
的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
(1)若
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d603566c74b1d5de510a2e8f7859010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b6142a74e0c6925014abd038c340f6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a8b8a93e92f9d7ffbd4cea9fdbd3f57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b83764876be47a196fd5f408763738a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)若
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d603566c74b1d5de510a2e8f7859010.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/635c966b753b329ea7441a9e1db13d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/7/df005a5a-d558-40fe-abfb-d1216c648050.png?resizew=175)
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真题
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【推荐2】在△ABC中,AB=AC,∠BAC=90°,AD是△ABC的角平分线.
(1)如图1,点E、F分别是线段BD、AD上的点,且DE=DF,AE与CF的延长线交于点M,则AE与CF的数量关系是 ,位置关系是 ;
(2)如图2,点E、F分别在DB和DA的延长线上,且DE=DF,EA的延长线交CF于点M.
①(1)中的结论还成立吗?如果成立,请给出证明;如果不成立,请说明理由;
②连接DM,求∠EMD的度数;
③若DM=6
,ED=12,求EM的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/17/2abb05fc-b52f-4be0-b4e9-c4b78beb8697.jpg?resizew=386)
(1)如图1,点E、F分别是线段BD、AD上的点,且DE=DF,AE与CF的延长线交于点M,则AE与CF的数量关系是 ,位置关系是 ;
(2)如图2,点E、F分别在DB和DA的延长线上,且DE=DF,EA的延长线交CF于点M.
①(1)中的结论还成立吗?如果成立,请给出证明;如果不成立,请说明理由;
②连接DM,求∠EMD的度数;
③若DM=6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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【推荐3】阅读下列材料并完成相应的任务.
任务:
(1)请按照上面的证明思路,写出该证明过程的剩余部分.
(2)图1中各角之间存在特殊的数量关系:①
;②
;③
.请你选择一个结论进行证明.
(3)如图3,在
中,
,点D是
的一个旁心,过点D作
,交
的延长线于点E,且
,则
的长为________.
三角形的旁心 三角形一个内角的平分域和其他两个内角的外角平分线的交点,称为该三角形的旁心,每个三角形有三个旁心.已知:如图1,在 ![]() ![]() ![]() ![]() ![]() ![]() ![]() 求证: ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 用理可得 ![]() …… |
(1)请按照上面的证明思路,写出该证明过程的剩余部分.
(2)图1中各角之间存在特殊的数量关系:①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b3cc8ac246a3f465791e37ed7e121ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2ac85484b9aeddacd7d9dbe447c6cbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f1c2aea5ce8016454fca334d704285.png)
(3)如图3,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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e13b639fd46e6a29ed193b9b035785e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e7f9e1e6fec2e75edfd23123fb79d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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名校
【推荐1】如图1,正方形
和正方形
,A,E,B三点共线,AB=8,
,将正方形
绕点A逆时针旋转
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/5662a54f-b4a5-4872-9217-92fc576e7f2b.png?resizew=384)
(1)如图2,求证:
;
(2)如图3,在旋转的过程中,当
三点共线时,试求BE的长;
(3)在旋转的过程中,是否存在某时刻,使得
,若存在,请直接写出BE的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7951f5af8359d2e1cdb1a6e008c91a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07681b79f2f245239f010b523171e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/5662a54f-b4a5-4872-9217-92fc576e7f2b.png?resizew=384)
(1)如图2,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1596f7c0d0bab4e7e586d705d323e0d8.png)
(2)如图3,在旋转的过程中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ba994ef3d38704df9030e19abc2bdf.png)
(3)在旋转的过程中,是否存在某时刻,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f224d15ee8fbf3741ec7813549a2924e.png)
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【推荐2】已知:如图1,在四边形
中,
,
.P是
边上一动点,联结
,将
绕点P顺时针方向旋转
,得到
,联结
.
是平行四边形;
(2)M是
延长线上一点,联结
,且
.
①若
,求证:
;
②如图2,若
,
,联结
、
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3a177e8e07b8f6eafef290ea2a74439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db8305c4ffbf876642440c3d28e91e9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30d6acb7b777d09e2847dc093af5fb7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac0a607dcacab33ae7ccf6ff1c8d29f.png)
②如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c76e0c221db78aca8a9ec892b22e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3525ddc5153fada64eaf14e50b536542.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da629df7bd5b88372df0dbc475b4d61.png)
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解答题-证明题
|
较难
(0.4)
【推荐1】已知:点O到△ABC的两边AB、AC所在直线的距离相等,且OB=OC.
![](https://img.xkw.com/dksih/QBM/2019/10/9/2308107695161344/2308274030329856/STEM/f6861b2e93e046919c901468a01d78a9.png?resizew=262)
(1)如图①,若点O在BC上,求证:AB=AC;
(2)如图②,若点O在△ABC的内部,上题的结论还成立吗?为什么?
(3)若点O在△ABC的外部,AB=AC成立吗?请画图表示.
![](https://img.xkw.com/dksih/QBM/2019/10/9/2308107695161344/2308274030329856/STEM/f6861b2e93e046919c901468a01d78a9.png?resizew=262)
(1)如图①,若点O在BC上,求证:AB=AC;
(2)如图②,若点O在△ABC的内部,上题的结论还成立吗?为什么?
(3)若点O在△ABC的外部,AB=AC成立吗?请画图表示.
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解答题-问答题
|
较难
(0.4)
【推荐2】如图1,直线
与x轴交于点A,与y轴交于点B,点C与点A关于y轴对称.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/ec475088-424d-4276-a6c1-bddb6318a920.png?resizew=412)
(1)求直线
的函数表达式;
(2)设点M是x轴上的一个动点,过点M作y轴的平行线,交直线
于点P,交直线
于点Q,连接
.
①若
,请直接写出点P的坐标______;
②若
的面积为
,请直接写出点M的坐标______;
③若点K为线段
的中点,连接
,如图2,若在线段
上有一点F,满足
,请直接写出点F的坐标______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8e2fa0e4383590afe6d8f1d7aa8bdc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/ec475088-424d-4276-a6c1-bddb6318a920.png?resizew=412)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)设点M是x轴上的一个动点,过点M作y轴的平行线,交直线
![](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/e69d2b798744645af88a4fa411344a83.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94ff267b4e9bc24c95c599d2b705671b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4700efcb84c4027ce7a50af0d5212fc.png)
③若点K为线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1bd75fbe8bec72e27a3b3b6d48f138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eecc861fba3f5ed9f08815c223a2179e.png)
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