2010高三·全国·专题练习
1 . 如图所示,过
外一点
作一条直线与
交于
,
两点,已知
,点
到
的切线长
,则弦
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fca8c94add435f4aefb933ffe55a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2 . 如图,
是⊙
的一条切线,切点为
,
都是⊙
的割线,已知
.
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/0433185da23348ebbc2634ecf58fb27d.png)
(1)证明:
;
(2)证明:
.
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/2160e9cb7cc2449683d385ca9a8d793b.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/6d34337901704bd9aac7b1ad1b614718.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/279e4ecbd94948f581ddc16bd8a8ce07.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/cee35282c57a49c7ab7d3e753de90814.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/6d34337901704bd9aac7b1ad1b614718.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/170af1474dfd42e4858b0eea7a9b4191.png)
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/0433185da23348ebbc2634ecf58fb27d.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/b60f01e161974194a85559379f37d6fd.png)
(2)证明:
![](https://img.xkw.com/dksih/QBM/2013/12/3/1571421837418496/1571421843177472/STEM/e5a4cd78aad44199970b7f674bc85159.png)
您最近一年使用:0次
3 . 如图,在圆内接四边形
中,
,
,
,则四边形
周长的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93a581bf97b7c14089725ce108b070d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/2017/3/3/1635737700802560/1636762269335552/STEM/f22b7064b19e448dad0eb49baafc4d2b.png?resizew=156)
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真题
4 . 如图所示,过
外一点
作一条直线与
交于
,
两点,已知
,点
到
的切线长
,则弦
的长为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fca8c94add435f4aefb933ffe55a01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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5 . 如图,
是半圆
的直径,点
为半圆
外一点,
分别交半圆
于点
.若
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d240ea67c239b0d9213448c11cba18c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58fc6a5e71fa379d613ac1ef1cdf1048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41b05e11ba5eadaaed9a224b949774.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2017/2/4/1619478440148992/1619478440919040/STEM/78f1fd1b309d4f729bdac06af6e8842b.png)
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6 . [选修4-1:几何证明选讲]
如图,已知凸四边形
的顶点在一个圆周上,另一个圆的圆心
在
上,且与四边形
的其余三边相切.点
在边
上,且
.
求证:
,
,
,
四点共圆.
如图,已知凸四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2017/2/3/1619477902778368/1619477903532032/STEM/5cb641e06fd34edeba2a92b40698fc1b.png)
您最近一年使用:0次
7 . 如图所示,在
中,
为
上一点,
,连接
,且
交与点
,则
等于
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519356416/STEM/78582123b1df4d2f8e39a79853a47dd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8abc2564d10cfa058a8d42677c225168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388984e5fdc47af1f0538b658d16694a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8fae5286f4db94b807b631ff00c45b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4da3fb95c834a18fc66ec45efa4ef03.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519356416/STEM/78582123b1df4d2f8e39a79853a47dd1.png)
A.4:10:25 | B.4:9:25 |
C.2:3:5 | D.2:5:25 |
您最近一年使用:0次
8 . 如图所示,在
中,
是
的中点,
平分
,
,若
,
,则
的长为
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519323648/STEM/17a64e157b3b48aca3abb8634c7c647e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82579abfc42e714912f3897067b45086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa4b1fdfa6c28c7b4113ba306547aa4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d1db984d94f60d33a95c1b112536ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/2017/1/25/1619472519102464/1619472519323648/STEM/17a64e157b3b48aca3abb8634c7c647e.png)
A.2 | B.2.5 |
C.3 | D.3.5 |
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9 . 在
中,
是
的中点,过点
作
,交
于点
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95a078495ba47076ccaa28b46f765d80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
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10 . 若三角形的三条边之比为3:5:7,与它相似的三角形的最长边为
,则其余两边的长度之和为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c46dfb41bf21292ed4ba45d576148756.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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