如图,在
中,
,
,
.以
为直径的
交
于
,
是
的中点,连接
并延长交
的延长线于点
.
是
的切线;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/8455657dde27aabe6adb7b188e031c11.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/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
更新时间:2020-01-06 18:25:59
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解答题-证明题
|
较难
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真题
【推荐1】如图,在⊙O中,AB为直径,OC⊥AB,弦CD与OB交于点F,在AB的延长线上有点E,且EF=ED.
![](https://img.xkw.com/dksih/QBM/2015/7/21/1573880748752896/1573880755118080/STEM/f1c34d7cfe424a1ab4d23b7d3d700e2f.png)
(1)求证:DE是⊙O的切线;
(2)若OF:OB=1:3,⊙O的半径R=3,求
的值.
![](https://img.xkw.com/dksih/QBM/2015/7/21/1573880748752896/1573880755118080/STEM/f1c34d7cfe424a1ab4d23b7d3d700e2f.png)
(1)求证:DE是⊙O的切线;
(2)若OF:OB=1:3,⊙O的半径R=3,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea9ca97c8cd8eac7f583630a9b0f38fe.png)
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【推荐2】如图,
中,
,
为
的直径,C在
上且为
的中点,过点A作
,连接
,
于点E.
为
的切线;
(2)记
,
,
的面积分别为
,
,
,若
,求
的值;
(3)若
的半径为1,设
,
,试求y关于x的函数解析式,并写出自变量x的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f26e9f2814410325fdd6d7a2f114622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b62ce0cbffa4758c7a0e6fb7ca4d24e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd75c2244c18120b8fc35d5d309ab66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97749805cfcfa348b33c1c25699fb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9acfad00530c2ba9e83cb1b0c2934c.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fa41f80c6e33393a9f7bb57fca6b493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f2fa55a62a1ef96393e18fbe08ca66f.png)
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【推荐1】如图,在△
中,
,以
为直径的⊙O分别交
于点
, 点
在
的延长线上,且
∠![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/7ee9d5833edf46f7bd8baf87115b57a8.png?resizew=36)
∠![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/c6a64e6f517345a099efb3fd7f7c3dad.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/6ab6a144f75f45ed8d5c1b4b7403a475.png?resizew=165)
(1) 求证:AB⊥BF
(2) 若
sin∠CBF=
, 求BC和BF的长.
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/5068f18920524d078614a509caa715df.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/67bd3d0da2b34c38a6d17eeed9c29b5b.png?resizew=65)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/e9524300cae64588b4de38aea51fcf02.png?resizew=27)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/f5b6d0b48a2946a9a4f46b9c94258a09.png?resizew=64)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/52634e212b8b4c99b18d2efb093be508.png?resizew=44)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/d42c82ac047a43ceb74971918925134d.png?resizew=17)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/634b6199ed3142ecacad8e0c87ca5d8a.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/8a4bc1a75e06429aa3c8c62c311c1022.png?resizew=12)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/7ee9d5833edf46f7bd8baf87115b57a8.png?resizew=36)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/c9c965bc519b48008869cd912b854c3e.png?resizew=28)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/c6a64e6f517345a099efb3fd7f7c3dad.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/6ab6a144f75f45ed8d5c1b4b7403a475.png?resizew=165)
(1) 求证:AB⊥BF
(2) 若
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/56b8b582185741a7aae92ab2b4cf0c90.png?resizew=55)
![](https://img.xkw.com/dksih/QBM/2012/2/25/1573346414567424/1573346477834240/STEM/d95e41f0ee26438f96c1040c98763281.png?resizew=27)
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解题方法
【推荐2】已知
为
的直径,点C和点D为
上的动点(两点在
的异侧且都不与A、B重合),连接
与
交于点E,连接
,
.
,
,求
的度数;
(2)如图2,在(1)的条件下,若
,求
的长度;
(3)如图2,若
,
,且对任意的点C,弦
上都有一点F满足
,连接
,求线段
的最小值.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da6ca8d888958c9a805563bdcc498b74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
(2)如图2,在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a03e0d9ec888c1c343853295c40318b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c9f2415d582cc5522eab5d12e827870.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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