如图①已知线段CD所在直线的解析式为y=﹣
x+3,分别交坐标轴于点C、D,
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372457569370112/2372920135589888/STEM/d05433dee7e94d95bfcb721fce8d2d7d.png?resizew=282)
(1)若以点B(1,0)为圆心的⊙B半径为r,⊙B与线段CD只有一个交点,则r满足 .
(2)如图②,如果点P从(﹣5,0)出发,以1个单位长度的速度沿x轴向右作匀速运动,当运动时间到t秒时,以点P为圆心、
t个单位长度为半径的圆P与线段CD所在直线有两个交点,分别为点E、F,且∠EPF=2∠OCD,求此时t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://img.xkw.com/dksih/QBM/2020/1/8/2372457569370112/2372920135589888/STEM/d05433dee7e94d95bfcb721fce8d2d7d.png?resizew=282)
(1)若以点B(1,0)为圆心的⊙B半径为r,⊙B与线段CD只有一个交点,则r满足 .
(2)如图②,如果点P从(﹣5,0)出发,以1个单位长度的速度沿x轴向右作匀速运动,当运动时间到t秒时,以点P为圆心、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
更新时间:2020-01-08 23:41:17
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【推荐1】如图,直线
交x、y轴分别为
、
两点,点
与点
关于y轴对称.动点
、
分别在线段
、
上(点
不与点
、
重合),满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/1ef049a1-e5dd-4214-8ff2-b46b25951360.png?resizew=180)
(1)点
坐标是_______,
______.
(2)当点
在什么位置时,
,说明理由.
(3)当
为等腰三角形时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8370f9a0bfe03687bf211d09743ee682.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1ea6aad5ca8ca1f16d466011027f3d4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/1ef049a1-e5dd-4214-8ff2-b46b25951360.png?resizew=180)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acfc3c93ddfde1b64bd93955c762eefe.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a551505ae42b49904bab59b17012d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐2】如图,直线y=﹣x+1与x轴,y轴分别交于B,A两点,动点P在线段AB上移动,以P为顶点作∠OPQ=45°交x轴于点Q.
![](https://img.xkw.com/dksih/QBM/2019/3/27/2169543590641664/null/STEM/6b66c2227ba1411298c7f973d7b0da4a.png?resizew=183)
(1)求点A和点B的坐标;
(2)比较∠AOP与∠BPQ的大小,说明理由.
(3)是否存在点P,使得△OPQ是等腰三角形?若存在,请求出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2019/3/27/2169543590641664/null/STEM/6b66c2227ba1411298c7f973d7b0da4a.png?resizew=183)
(1)求点A和点B的坐标;
(2)比较∠AOP与∠BPQ的大小,说明理由.
(3)是否存在点P,使得△OPQ是等腰三角形?若存在,请求出点P的坐标;若不存在,请说明理由.
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【推荐1】在直角坐标系中,O为坐标原点,点A坐标为(2,0),以OA为边在第一象限内作等边△OAB,C为x轴正半轴上的一个动点(OC>2),连接BC,以BC为边在第一象限内作等边△BCD,直线DA交y轴于E点.
(1)求证:△OBC≌△ABD
(2)随着C点的变化,直线AE的位置变化吗?若变化,请说明理由;若不变,请求出直线AE的解析式.
(3)以线段BC为直径作圆,圆心为点F,当C点运动到何处时,直线EF∥直线BO;这时⊙F和直线BO的位置关系如何?请给予说明.
(1)求证:△OBC≌△ABD
(2)随着C点的变化,直线AE的位置变化吗?若变化,请说明理由;若不变,请求出直线AE的解析式.
(3)以线段BC为直径作圆,圆心为点F,当C点运动到何处时,直线EF∥直线BO;这时⊙F和直线BO的位置关系如何?请给予说明.
![](https://img.xkw.com/dksih/QBM/2019/6/1/2216169423822848/2217824694288384/STEM/c59123d611d9450caa5a8e0230529ce2.png?resizew=102)
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【推荐2】已知:抛物线
与x轴相交于A、B(A点在B点的左边),与y轴相交于点C,若点B的坐标为
经过A、B、C三点.
![](https://img.xkw.com/dksih/QBM/2021/11/4/2843815854129152/2927524778950656/STEM/3707d815b2814d9a82f73af07fa9846b.png?resizew=245)
(1)求c的值;
(2)求
的半径;
(3)过C点作直线交x轴于D,当直线
与抛物线只有一个交点时,直线
是否与
相切?如果相切,请证明之;如果相交,请求出直线
与圆的另外一个交点的坐标;
(4)点E、F分别为
与抛物线上的动点,当点O、C、E、F四点构成的四边形为以
为边的平行四边形时,请直接写出点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef95a69e3f767fdd2227d1fd5c06ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b004c263d4f128aafc0d46a1ac5e5281.png)
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(1)求c的值;
(2)求
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(3)过C点作直线交x轴于D,当直线
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(4)点E、F分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fef27cb7cb1b666c1734c65a7aa9aa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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【推荐1】如图
,
中,点
在线段
上,点
在线段
延长线上,且
,
交直线
于点
,交直线
于点
,
.
(1)图1中是否存在与
相等的线段?若存在,请找出,并加以证明,若不存在,说明理由;
(2)若将“点
在线段
上,点
在线段
延长线上”改为“点
在线段
延长线上,点
在线段
延长线上”,其他条件不变(如图).当
,
,
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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(1)图1中是否存在与
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(2)若将“点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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【推荐2】如图1,在平行四边形
中,
平分
交
于点E,
于点F,交
于点G,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/4b5a8b1b-e51e-4670-a389-388fbb7499db.png?resizew=270)
(1)求证:
.
(2)若
,求BC的长度;
(3)在(2)的条件下,如图2,若
平分
交
于点M,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/4b5a8b1b-e51e-4670-a389-388fbb7499db.png?resizew=270)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a3a922f7ea64083c415c72259179a3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1677251d0984f7c70e704e91eee4569a.png)
(3)在(2)的条件下,如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/300d3ec6447250bb25915ae86873929a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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