选修4—1:(几何证明选讲)
如图,
ABC是直角三角形,
ABC=90
.以AB为直径的圆O交AC于点E,点D是BC边的中点.连OD交圆O于点M.
![](https://img.xkw.com/dksih/QBM/2016/7/15/1572923997904896/1572924004106240/STEM/3705969fb57e4bdc9641fe78ef2f235b.png)
(Ⅰ)求证:O,B,D,E四点共圆;
(Ⅱ)求证:
.
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e033f67841bcb481db65d3ce495f0b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff522636907ba2f6cbcbc1f443d6e05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a4ad5ef8b9f8353a980bd251c7a58e.png)
![](https://img.xkw.com/dksih/QBM/2016/7/15/1572923997904896/1572924004106240/STEM/3705969fb57e4bdc9641fe78ef2f235b.png)
(Ⅰ)求证:O,B,D,E四点共圆;
(Ⅱ)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06b68a6ea02d99a62c04fa2f0ef3cca8.png)
更新时间:2016-12-04 17:04:59
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【知识点】 几何证明选讲
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】已知四边形
为圆
的内接四边形,且
,
切圆
于点
且交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572926695251968/1572926701780992/STEM/d8b368a88d8c470abce08073c93a749c.png?resizew=203)
(1)求证:
;
(2)若
,
,
,试求圆
的半径的长.
![](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/325d00656ae1b8d8923ec53b426d22b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/236abcd5701f3d6d512f022a0f5abc9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://img.xkw.com/dksih/QBM/2016/7/22/1572926695251968/1572926701780992/STEM/d8b368a88d8c470abce08073c93a749c.png?resizew=203)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e839007f29f4c72dfd700292ceb8802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348513d257538d4dd1b400987b623256.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7809143e0e8692d6d4058891bf02559f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,在
中,
,
平分
,交
于点
,过点
作
交
于点
.
![](https://img.xkw.com/dksih/QBM/2016/10/4/1573052232507392/1573052238561280/STEM/f9a64a1340cd406ca79457cd98f2b8e3.png?resizew=245)
(1)求证:
;
(2)已知
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3884d6b8273958f9caf3ecd927fdd50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2016/10/4/1573052232507392/1573052238561280/STEM/f9a64a1340cd406ca79457cd98f2b8e3.png?resizew=245)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e2ee429f753da92a711b40ec0dd6bb.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4db3d5ecdceba51deccbfd2d4f4a97f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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