1 . 选修4—1:几何证明选讲
如图所示,
是
的直径,
切
于点
,
,
交
于点
,
的延长线交
于点
,
的延长线交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/11fe69ca-dee8-4c8d-9af3-fb073c2b9ff3.png?resizew=229)
(1)求证:
;
(2)若
的直径
,求
的值.
如图所示,
![](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/60ef95894ceebaf236170e8832dcf7e3.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/1d384390f4e0a1e0abd4cc19382d94db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](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/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/2/11fe69ca-dee8-4c8d-9af3-fb073c2b9ff3.png?resizew=229)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78858773f5b543687f4abb6baf5f364c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b375486dd64c51c1c6c6e05136a4ad3c.png)
您最近一年使用:0次
2 . 如图,
是
的一条切线,切点为
和
都是
的割线,
.
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9e9bab8eb07245379fc32b764f682bfd.png)
(1)证明:
;
(2)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/fe907a13c78f4df2b148264b347f53c4.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9486e164e97c42ba9b11d76488b2dc0d.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/70f2130fe3e44473bf8748e5f5c32c3b.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/fe907a13c78f4df2b148264b347f53c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625b4c2492d39e4f369cb5e724b00af1.png)
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/9e9bab8eb07245379fc32b764f682bfd.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/96b71fce156143ea8d4a1bb55c16136f.png)
(2)证明:
![](https://img.xkw.com/dksih/QBM/2016/8/4/1572959041642496/1572959047884800/STEM/0c69a9250af54dcb8e09d6ae3a52a9b7.png)
您最近一年使用:0次
2013·河南郑州·一模
3 . 如图,在△ABC中,CD是∠ACB的平分线,△ACD的外接圆交BC于点E,AB=2AC.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560111501312/1572560117145600/STEM/e1066d69f14c4558aded214b8d4dc80a.png)
(Ⅰ)求证:BE=2AD;
(Ⅱ)当AC=1,EC=2时,求AD的长.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560111501312/1572560117145600/STEM/e1066d69f14c4558aded214b8d4dc80a.png)
(Ⅰ)求证:BE=2AD;
(Ⅱ)当AC=1,EC=2时,求AD的长.
您最近一年使用:0次
2016-12-02更新
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5卷引用:2016届重庆市巴蜀中学高三3月月考理科数学试卷2
2016届重庆市巴蜀中学高三3月月考理科数学试卷2(已下线)2014届河南省中原名校联盟高三上学期第一次摸底考试理科数学试卷(已下线)2014届河南省中原名校联盟高三上学期第一次摸底考试文科数学试卷2016届吉林省松原市油田高中高三上学期期末文科数学试卷2016届广西来宾市高三上学期期末文科数学试卷
12-13高三·河南南阳·阶段练习
4 . 如图,在
中,
是
的角平分线,
的外接圆交
于点
,
.
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572696996036608/1572697002213376/STEM/a1d2f57cf6d74c838b101b1424485b37.png)
(1)证明:
;
(2)当
,
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0427054c47e348f35771872fd0215a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c71855e55064d1dc59eabe43e73a881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846071242f981289741ad19f4e7190cf.png)
![](https://img.xkw.com/dksih/QBM/2016/6/7/1572696996036608/1572697002213376/STEM/a1d2f57cf6d74c838b101b1424485b37.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679372e54c59c5cf67931b12b9833e02.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca036d049f5205cf04cb1b9c5cd03f97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f7d9f5e71bfef8188b1216c1276c2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
2016-12-02更新
|
728次组卷
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7卷引用:2015-2016学年重庆八中高二下阶段性检测五文科数学试卷