如图,
中,以
边上一点
为圆心作圆,
与边
、
分别切于点
、
,
与
另一交点为
.
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397525176639488/2398171425333248/STEM/9678f8a6032043c688d34d53d998e51c.png?resizew=206)
(1)求证:
;
(2)若
的半径为
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6da755b27b851ab0ea7dd9ba38678fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/2/12/2397525176639488/2398171425333248/STEM/9678f8a6032043c688d34d53d998e51c.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6fa1d4e8273f7f0eb6d22251b293650.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/598ddbb5b7c8efa0c9e69210a9861cd1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
更新时间:2020-02-13 15:55:09
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,
,
是斜边
上的中线,点P是线段
延长线上一点,点E是线段
的中点,连接
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/d57ec1e3-f4ee-4384-a558-37a461ce18e7.png?resizew=401)
(1)求证:
;
(2)如果
,连接
,点G在线段
上,当点G满足怎样的条件时,以点C、D、E、G为顶点的四边形
是菱形?
(3)当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ac81d2e5a2f17ee2b35f7158f1fc35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/d57ec1e3-f4ee-4384-a558-37a461ce18e7.png?resizew=401)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebae96e7234db2344d6b54952e57636f.png)
(2)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4398a409532d9a2a7504f91c5be1b93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bba134b8dcecf5b81721abe3b34e1b1.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e668991786c0602f3b2e673e4aafb60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
解题方法
【推荐2】如图,
内接于
,且
,
.
是劣弧
上一点,
分别交
,
于点
,点
,交
于点
.
(1)当
经过圆心时,
①求证:
平分
;
②求
的值;
(2)考生注意:本题有三小题,第①题2分,第②题3分,第③题4分,请根据自己的认知水平,选做其中一题.
①连接
,求证:
;
②连接
,求证:
;
③连接
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0896521d46a6b47c995c58959bc1041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d2e59adb72e5bac676270c667b1a691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/409cfd1f-3c5b-4881-ab71-04af655636f4.png?resizew=156)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bff4a9da6e1d8b023a77ef618a050a56.png)
(2)考生注意:本题有三小题,第①题2分,第②题3分,第③题4分,请根据自己的认知水平,选做其中一题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/25/f9455f99-0920-41f1-9e25-ad5b01fd6a6e.png?resizew=157)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8fb80f198f13fa35b1a2e518f9be444.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64da36eafa363be25aa3c0ecbc39952a.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c935be24efb87a20494d25d585477741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知:在平面直角坐标系中,抛物线
(
)交x轴于A、B两点,交y轴于点C,且对称轴为直线x=-2 .
![](https://img.xkw.com/dksih/QBM/2017/3/28/1653751315841024/1657128471453696/STEM/05d895e11a114f6b925315b7b19e0678.png?resizew=254)
(1)求该抛物线的解析式及顶点D的坐标;
(2)若点P(0,t)是y轴上的一个动点,请进行如下探究:
探究一:如图1,设△PAD的面积为S,令W=t·S,当0<t<4时,W是否有最大值?如果有,求出W的最大值和此时t的值;如果没有,说明理由;
探究二:如图2,是否存在以P、A、D为顶点的三角形与Rt△AOC相似?如果存在,求点P的坐标;如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed1fdb295c15a6065f36d0d4c3b44bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://img.xkw.com/dksih/QBM/2017/3/28/1653751315841024/1657128471453696/STEM/05d895e11a114f6b925315b7b19e0678.png?resizew=254)
(1)求该抛物线的解析式及顶点D的坐标;
(2)若点P(0,t)是y轴上的一个动点,请进行如下探究:
探究一:如图1,设△PAD的面积为S,令W=t·S,当0<t<4时,W是否有最大值?如果有,求出W的最大值和此时t的值;如果没有,说明理由;
探究二:如图2,是否存在以P、A、D为顶点的三角形与Rt△AOC相似?如果存在,求点P的坐标;如果不存在,请说明理由.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如果三角形的两个内角
与
满
,那么我们称这样的三角形为“准直角三角形”.
(1)若
是“准直角三角形”.
,则
°.
(2)如图1,
是
的外接圆,
是
的直径,
,D是
上的一点,
,若
,请判断
是否为准直角三角形,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/5e5ff7e5-d899-444d-956f-04f322f31605.png?resizew=175)
(3)如图2,
是
的外接圆,
是
的直径,E是直径
下方半圆上的一点,
,
,若
为”准直角三角形”,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/b588f365-7748-45c0-8fd7-da47b5416938.png?resizew=200)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a8219dba824245096c48d3e46f40b5.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9359f06a8432735fce32e5225f881dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
(2)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7503d01521ba83f913793dbe30a07038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3a7eb1ce2d86893abd16caa22c85b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/5e5ff7e5-d899-444d-956f-04f322f31605.png?resizew=175)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f774df6f53dedd46a2a9994094e8677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/b588f365-7748-45c0-8fd7-da47b5416938.png?resizew=200)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/3/a738c8bf-8552-4d4a-94e5-cf8f44e7013f.png?resizew=195)
您最近一年使用:0次