已知,如图,以点P(﹣1,0)为圆心的圆,交x轴于A、C两点(A在C的左侧),交y轴于B、D两点(B在D的上方),且∠BAC=30°,
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573953956823040/1573953963212800/STEM/8d2ed0e3a27846b587e82f6a89d56f05.png)
(1)如图①求⊙P的半径及点B的坐标;
(2)点Q是⊙P上任意一点,求△ABQ面积S的取值范围;
(3)如图②,已知点M(-5,0),过M作直线y=kx+b交y轴于点N,
①若MN//AB,试判断MN与⊙P的位置关系,并说明理由;
②在该直线上存在一点G,使以G、A、C为顶点的三角形是直角三角形,且满足条件的点G有且只有三个不同位置,求直线MN的函数关系式.
![](https://img.xkw.com/dksih/QBM/2016/1/14/1573953956823040/1573953963212800/STEM/8d2ed0e3a27846b587e82f6a89d56f05.png)
(1)如图①求⊙P的半径及点B的坐标;
(2)点Q是⊙P上任意一点,求△ABQ面积S的取值范围;
(3)如图②,已知点M(-5,0),过M作直线y=kx+b交y轴于点N,
①若MN//AB,试判断MN与⊙P的位置关系,并说明理由;
②在该直线上存在一点G,使以G、A、C为顶点的三角形是直角三角形,且满足条件的点G有且只有三个不同位置,求直线MN的函数关系式.
更新时间:2016-12-06 04:00:26
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解答题-证明题
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【推荐1】小华遇到一个数学问题,他进行了研究、推理与拓展.
【问题】如图1,点A、B在直线l的同侧,在直线l上是否存在点C,使得
?
【研究】如图2,作点A关于直线l的对称点
,连结
,交直线l于点C,连结
,则点C就是要找的点.小华把这样的点C叫做点A、B关于直线l的“反射点”.
【推理】证明图2中
成立.
【拓展】如图3,在平面直角坐标系中,已知直线l的解析式为
.
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671374281736192/2671446411812864/STEM/be2efc24-101e-4463-b46f-3832927eaa95.png)
(1)若点C是点
关于直线l的反射点,求点C的坐标.
(2)点E、F在x轴的正半轴上(点E在点F的左侧),若点E、F关于直线l的反射点为
,且
,求点E、F的坐标.
请帮助小华解决“推理”“拓展”中的问题.
【问题】如图1,点A、B在直线l的同侧,在直线l上是否存在点C,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
【研究】如图2,作点A关于直线l的对称点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e663220a66eff19da6a71e46b397db2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【推理】证明图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
【拓展】如图3,在平面直角坐标系中,已知直线l的解析式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://img.xkw.com/dksih/QBM/2021/3/5/2671374281736192/2671446411812864/STEM/be2efc24-101e-4463-b46f-3832927eaa95.png)
(1)若点C是点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ece1967ebc6d2d194928097a25f1941a.png)
(2)点E、F在x轴的正半轴上(点E在点F的左侧),若点E、F关于直线l的反射点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/606452078753789384d90613c2ec4dc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e5963f42d4195661bb0860b8d6c18d.png)
请帮助小华解决“推理”“拓展”中的问题.
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【推荐2】如图①,在
中,
于
,
,
,
,点
是
上一动点(不与点
,
重合),在
内作矩形
,点
在
上,点
、
在
上,设
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/514958a8-5bd0-4b48-a161-d3b2079b8c0e.png?resizew=321)
(1)当
______时
的面积为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
(2)设矩形
的面积为
,
的面积为
,令
,求
关于
的函数解析式;(要求写出自变量的取值范围)
(3)如图②,点
是(2)中得到的函数图像上的任意一点,
的坐标为
,当
为等腰三角形时,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.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/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c421ab2dc57f44899efb36549781347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/514958a8-5bd0-4b48-a161-d3b2079b8c0e.png?resizew=321)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
(2)设矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca1511bde876acd5c3403062be5186a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)如图②,点
![](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/4c0573e2af8a0dc8c6a1c0af067a324f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25dd698d57d1cf239eb8752aecaaa4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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【推荐1】定义:如果一个圆满足:圆心在三角形的一边上,与另一边相切,且经过三角形一个顶点(非切点),那么这个圆称为这个三角形圆心所在边上的“伴随圆”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/da76fadb-2f06-49be-bb1f-e69882e06285.png?resizew=355)
(1)如图①,在
中,
,则
边上经过点B的伴随圆的半径为 ;
(2)如图②,在
中,
,直接写出它的所有伴随圆的半径 ;
(3)如图③,在
中
,点E在边
上,
,D为
的中点,且
.
①求证:
的外接圆是
的
边上的伴随圆;
②求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/da76fadb-2f06-49be-bb1f-e69882e06285.png?resizew=355)
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c56f6592daf5ca76c082eaf9e676c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ed37e2f1484ae6d7c413a0d0c69f32.png)
(3)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8408cdf53667cef5c76fb3a2cec99e5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f864b11496cc738c29a737267cfc07cd.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80c06b39a3804e08a580e8defa3e84cb.png)
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名校
【推荐2】如图,
是
的切线,
是切点,
是直径,
是弦,连接
、
,
与
相交于点
,且
.
(1)求证:
是
的切线;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.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/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/a10e95d0-28bd-4e31-8742-26d1832ce9b9.png?resizew=164)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c78a8d05a206c3660450534885b261a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1a2a3ca97740b27193a7289833819ee.png)
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