如图,在
中,
为
的直径,弦
,垂足
在半径
上.若劣弧
沿着直线
翻折,点
落在
上的点
处(点
不与点
重合),连结
.
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748548036345856/2748640529121280/STEM/a7bd0e40f2234fbc879b001893ff6b03.png?resizew=152)
(1)求证:
.
(2)延长
交
于点
,连结
,若
,求
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](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/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f4411b37e8ed03b1841906af3bf912f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50a1e65b0ca7af33626860d401ec4c73.png)
![](https://img.xkw.com/dksih/QBM/2021/6/22/2748548036345856/2748640529121280/STEM/a7bd0e40f2234fbc879b001893ff6b03.png?resizew=152)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21ea33317acc15c13b25484464e3061c.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e795ada4b879404d5fd9c1e60fa574c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
2021·浙江·一模 查看更多[3]
2021年浙江省温州市龙港市中考数学一模试卷(已下线)【新东方】【2021.6.16】【omo】【初三下】【数学00126】(已下线)专题09 圆与三角形、四边形综合-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(浙教版)
更新时间:2021-06-22 19:46:22
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相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】正方形
的边长为4.
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980802610274304/2984290803884032/STEM/3552a3eb-c39d-4eb2-b169-13ffa76f8c84.png?resizew=297)
(1)将正方形
对折,折痕为
,如图①把这个正方形展平,再将点
折到折痕
上的点
的位置,折痕为
,求
的长;
(2)如图②当
时,在点
由点
移动到
中点的过程中,求
面积的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2022/5/16/2980802610274304/2984290803884032/STEM/3552a3eb-c39d-4eb2-b169-13ffa76f8c84.png?resizew=297)
(1)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)如图②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/3bbd6f0a0412d0f43ce1f7c1d530e56e.png)
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【推荐2】【模型搭建】(1)如图1,
是等边三角形
的边
上一点,现将
折叠,使点
与点
重合,折痕为
,点
分别在
和
上.
①若
,则
______.
②若
,
与
的周长分别为
,则
______,
______.
【灵活应用】(2)如图2,在
中,
,
,点
分别在边
上将
沿
向下翻折至
,连结
平分
.若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b4abdf8f9724ea783fe85af3beaa37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c0401d394546dcf04cfead7d5b8f97.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d6ceed6e5a36193bcb5a557853dbee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25d95565e1e7f522624ed32e5a61199.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/705d0cd198f423d1a7d6b9a7999c18ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f844e79fa57b77f0fea1d0ef8a4937bc.png)
【灵活应用】(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dec2ca6438c82b43f746057d8129885.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc7f32e4c7d1fcafc3fe0dbcf08fdd2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d218b0fc3b6a8d8bb9d7474a071fafb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d3395d137abd71668a677b94e9932b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fb71fbc47fd87e9ce011652ef4186.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/0026939b-2fb1-4030-8c1c-c725589d9b7b.jpg?resizew=263)
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解题方法
【推荐3】如图,Rt△AOB中,∠AOB=90°,OA=OB=4,点P在直线OA上运动,连接PB,将△OBP沿直线BP折叠,点O的对应点记为O′.
(1)若AP=AB,则点P到直线AB的距离是 ;
(2)若点O′恰好落在直线AB上,求△OBP的面积;
(3)将线段PB绕点P顺时针旋转45°得到线段PC,直线PC与直线AB的交点为Q,在点P的运动过程中,是否存在某一位置,使得△PBQ为等腰三角形?若存在,请直接写出OP的长;若不存在,请说明理由.
(1)若AP=AB,则点P到直线AB的距离是 ;
(2)若点O′恰好落在直线AB上,求△OBP的面积;
(3)将线段PB绕点P顺时针旋转45°得到线段PC,直线PC与直线AB的交点为Q,在点P的运动过程中,是否存在某一位置,使得△PBQ为等腰三角形?若存在,请直接写出OP的长;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/12/5/2865742279417856/2870979074424832/STEM/fa4bc4e6-d1f3-4232-bdca-21022b09e1ee.png?resizew=513)
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名校
【推荐1】问题提出
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/175387e9-a592-422b-a6ab-7f9c80369a4a.jpg?resizew=570)
如图1,在
中,
,
,
,则
的面积为________;
问题探究
如图2,在
中,
,
,
.点
是三个内角角平分线的交点.点
在
边上,且
.在边
找一点
,使得四边形
面积是
面积的
.求出此时
的长度;
问题解决
如图3,某开发区将设计改造一块五边形
空地.已知
,
,按照设计需求
,
且满足
.现设计规划在阴影部分
区域种植花卉.公司为了节约成本,满足设计需求,种植花卉阴影部分即
区域的面积尽可能小.请你计算出种植花卉
面积的最小值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/18/175387e9-a592-422b-a6ab-7f9c80369a4a.jpg?resizew=570)
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
问题探究
如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55cd495dbd7296b0092fa3e1ef77477.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fa0a286a55692e4263a5993b01580b.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/6897c275957c00bb8237021a80843ad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1985174e05ad371e13cf24d244423da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
问题解决
如图3,某开发区将设计改造一块五边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e17772c90b572dbe077d1c5594d11300.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a6f83567c788db941b7e39f1c3b518d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/066cd386723885c535ea720f5817847a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe92d62834a7d5dfbd88e414a4b64f7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
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较难
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【推荐2】![](https://img.xkw.com/dksih/QBM/2022/3/1/2926952526110720/2963014394322944/STEM/0f5314ee-cc78-4ba1-b24b-ebe708a4418e.png?resizew=574)
(1)问题发现
如图 1,△ABC和△CDE均为等边三角形,直线AD和直线BE交于点F.填空:
①∠AFB的度数是 ;
②线段AD,BE之间的数量关系为 ;
(2)类比探究
如图2,△ABC 和△CDE 均为等腰直角三角形,∠ABC=∠DEC=90°,AB=BC,DE=EC,直线AD和直线BE交于点F,请判断∠AFB的度数及线段AD,BE之间的数量关系,并说明理由.
(3)如图 3,在△ABC中,∠ACB=90°,∠A=30°,AB=5,点D在AB边上,DE⊥AC于点E,AE=3,将△ADE绕着点A在平面内旋转,请直接写出直线DE经过点B时BD的长为_____.
![](https://img.xkw.com/dksih/QBM/2022/3/1/2926952526110720/2963014394322944/STEM/0f5314ee-cc78-4ba1-b24b-ebe708a4418e.png?resizew=574)
(1)问题发现
如图 1,△ABC和△CDE均为等边三角形,直线AD和直线BE交于点F.填空:
①∠AFB的度数是 ;
②线段AD,BE之间的数量关系为 ;
(2)类比探究
如图2,△ABC 和△CDE 均为等腰直角三角形,∠ABC=∠DEC=90°,AB=BC,DE=EC,直线AD和直线BE交于点F,请判断∠AFB的度数及线段AD,BE之间的数量关系,并说明理由.
(3)如图 3,在△ABC中,∠ACB=90°,∠A=30°,AB=5,点D在AB边上,DE⊥AC于点E,AE=3,将△ADE绕着点A在平面内旋转,请直接写出直线DE经过点B时BD的长为_____.
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【推荐3】【选一选,填一填】
(1)⊙O的直径为20,圆上两点M、N距离为16,⊙O上一动点A到直线MN距离的最大值为( )
A.16 B.18 C.24 D.32
(2)等腰△ABC中,顶角∠ABC=45°,AM⊥BC,BN⊥AC,AM与BN交于点P,则
的值为 .
【画一画,算一算】
(3)如图是某百姓休闲广场的部分平面示意图,直角梯形ABCD中,∠ABC=90°,∠ADC=120°,CD长60米,BC长80米, 点E在CD边上,且CE长40米.根据规划,要在直角梯形ABCD内确定一点F,AF长25米,同时建造展示区△FDE和休闲区△FBC.已知展示区造价每平方米200元,休闲区造价每平方米100元,建造好展示区和休闲区最少需要多少元?
(1)⊙O的直径为20,圆上两点M、N距离为16,⊙O上一动点A到直线MN距离的最大值为( )
A.16 B.18 C.24 D.32
(2)等腰△ABC中,顶角∠ABC=45°,AM⊥BC,BN⊥AC,AM与BN交于点P,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3966b6e654f5ccc7880771cda927e341.png)
【画一画,算一算】
(3)如图是某百姓休闲广场的部分平面示意图,直角梯形ABCD中,∠ABC=90°,∠ADC=120°,CD长60米,BC长80米, 点E在CD边上,且CE长40米.根据规划,要在直角梯形ABCD内确定一点F,AF长25米,同时建造展示区△FDE和休闲区△FBC.已知展示区造价每平方米200元,休闲区造价每平方米100元,建造好展示区和休闲区最少需要多少元?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/4c3eaf90-d7c0-48e1-b138-288d3aaadd76.png?resizew=182)
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解答题-证明题
|
较难
(0.4)
【推荐1】如图1,在
中,
,
,点P是
内一个动点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/6119a3fd-ce77-49d2-b5c0-b7487445ba78.png?resizew=487)
(1)试找出与
相等的角,并说明理由.
(2)如图2,连接
并延长交
的外接圆
于点Q,交
于点D,连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
①求证
;
②求
的最小值.
(3)在如图2的条件下,若
,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942a9a6bde4a5b9803b68b1e9065de62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/6119a3fd-ce77-49d2-b5c0-b7487445ba78.png?resizew=487)
(1)试找出与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172766b458ea1e95ab1f5cd70bab7463.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
①求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7d23d8614be566e6dd3a0c68ea15450.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dac9bf5ac3d89d6847a585bf318b3ba8.png)
(3)在如图2的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f6f95e7b64ef2c99935ca58e44df645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074b9214844a7c8a0bca3d97e8c7a244.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,在
中,
,
,点
是边
延长线上的一点,
,垂足为点
的延长线交
的平行线
于点
,连接
交
于点
.
备用图
(1)当点
是
中点时,求
的长;
(2)设
,求
关于
的函数关系式及定义域;
(3)当
与
相似时,求线段
的长.
![](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/97e8c05f9da0a2071c6f19d3013eb75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c51c25b65a37b676ae3c3b71c29f9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b07f3700c45a84b02f153ea0fb20b4bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/93776d2d-0484-4702-b835-3888218f9e5d.png?resizew=184)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/17/68188391-5880-411b-b86a-2faa4ad852bd.png?resizew=174)
备用图
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e60f4ae284710715549d684981afb7f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3b07a8fb7f8bf24fb0cd0d9ccade9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6901cd2f1408f0fade304f39e4ba597c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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