名校
1 . 设集合
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98ecfa5aeaf5388f8780b0f960d330ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2019-08-23更新
|
1180次组卷
|
7卷引用:2019年10月江西省高三第一次大联考数学(文)试题
2 . 如图,过圆
外一点
作一条直线与圆
交于
两点,若
,点
到圆
的切线
,弦
平分弦
于点
,且
,则
等于
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572983232782336/1572983238721536/STEM/b6283de7fe1c4a6f8334e455478fc79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eea78bf026d76f1cb9cc3dc9349a193.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572983232782336/1572983238721536/STEM/a4efefc5ab1c4524a5b1452f2b3828f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2016/8/17/1572983232782336/1572983238721536/STEM/b6283de7fe1c4a6f8334e455478fc79e.png)
A.![]() | B.![]() | C.4 | D.3 |
您最近一年使用:0次
3 . 如图,AB为⊙O的直径,BD是⊙O的切线,连接AD交⊙O于E,若BD∥CE,AB交CE于M,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e4b0311cb57d78f465a57dc7f26353c.png)
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090404214185984/2094345211813888/STEM/647c1bdc-8188-4995-bad2-424c20db0e6d.png)
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真题
4 . 选修4-1:几何证明选讲
如图AB是
直径,AC是
切线,BC交
与点E.
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/4728723fed18470d84dbc7e44107ef4f.png)
(Ⅰ)若D为AC中点,求证:DE是
切线;
(Ⅱ)若
,求
的大小.
如图AB是
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/f611407c50d540ad9104c02c63aee4ba.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/f611407c50d540ad9104c02c63aee4ba.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/f611407c50d540ad9104c02c63aee4ba.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/4728723fed18470d84dbc7e44107ef4f.png)
(Ⅰ)若D为AC中点,求证:DE是
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/f611407c50d540ad9104c02c63aee4ba.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/67dc69fe27884a1a8ff1aaa71bdd61c7.png)
![](https://img.xkw.com/dksih/QBM/2015/6/24/1572143053012992/1572143059132416/STEM/ce093531127143b1baddcccf84486568.png)
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5 . (几何证明选讲选做题)如图,
、
是⊙
的两条切线,切点分别为
、
.若
,
,则⊙
的半径为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2015/5/13/1572103746469888/1572103752212480/STEM/613f1eae48bc433c8991e8f246e4c6cc.png?resizew=182)
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2016-12-03更新
|
427次组卷
|
2卷引用:2015届广东省深圳市高三第二次调研考试理科数学试卷
6 . (几何证明选做题)如图,已知
内接于圆
,点
在
的延长线上,
切圆
于
,若
,
,则
的长为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb01d2b57580731c8b807ac8cffc8ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2015/3/24/1572021911527424/1572021917130752/STEM/8d444bc8f9494355b491ed6c71cc4ff9.png?resizew=126)
您最近一年使用:0次
12-13高三下·河北石家庄·阶段练习
7 . 选修4-1几何证明选讲
如图,AB是
O的直径,BE为圆0的切线,点c为
o 上不同于A、B的一点,AD为
的平分线,且分别与BC 交于H,与
O交于D,与BE交于E,连结BD、CD.
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/b348fe291c244484bf89e15a5a8a6a2c.png)
(I )求证:BD平分![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/f54719e7f9d54dee90b65968e935b270.png)
(II)求证:AH•BH=AE•HC
如图,AB是
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/8b43c3c3b2144703b527e83c122a5c2a.png)
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/8b43c3c3b2144703b527e83c122a5c2a.png)
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/2d4d4061425c45c6aaf748b93fc86366.png)
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/8b43c3c3b2144703b527e83c122a5c2a.png)
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/b348fe291c244484bf89e15a5a8a6a2c.png)
(I )求证:BD平分
![](https://img.xkw.com/dksih/QBM/2013/3/15/1571143959781376/1571143965417472/STEM/f54719e7f9d54dee90b65968e935b270.png)
(II)求证:AH•BH=AE•HC
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