如图, 在
中,
,
, 点
分别在近
,
上, 且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/a1457db4-f6b5-438a-8e06-8dc016e348ac.jpg?resizew=218)
(1)求证:
;
(2)当
时, 求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0896521d46a6b47c995c58959bc1041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d194ea0173c3e096ffb9146a85743d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3648c864f9f58da1dbb166fee84cfeaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/102e836344156ea835d7d4e9b4120fe8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/a1457db4-f6b5-438a-8e06-8dc016e348ac.jpg?resizew=218)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbfb7665a54463b68487b6c53cdd97b3.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0aa4c793921fdaa5d430cb90d78ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
更新时间:2022-11-06 14:28:47
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【推荐1】在△ABC中,AD是高,矩形PQMN的顶点P、N分别在AB、AC上,QM在边BC上.若BC=8cm,AD=6cm,且PN=2PQ,求矩形PQMN的周长.
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解答题-问答题
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真题
【推荐2】如图,在平面直角坐标系
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在反比例函数
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,
,
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,
,
为顶点的四边形为平行四边形,求点
的坐标和
的值;
(3)过
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两点的直线与
轴负半轴交于点
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关于
轴对称.若有且只有一点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b74381f68eb1e33d412a7a3d62313f.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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解答题-证明题
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适中
(0.65)
【推荐1】已知:如图,△ABD∽△ACE.求证:
(1)∠DAE=∠BAC;
(2)△DAE∽△BAC.
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/e27083c2-d029-4960-b3ec-c8a70426066d.png?resizew=131)
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解答题-证明题
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适中
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【推荐2】如图,已知线段AB∥CD,AD与B C相交于点K,E是线段AD上一动点.
![](https://img.xkw.com/dksih/QBM/2012/5/19/1573382033162240/1573382088892416/STEM/ff269c51-a91c-4aae-9f56-bd29b0cee753.png)
(1)若BK=
KC,求
的值
(2)连接BE,若BE平分∠ABC,则当AE=
AD时,猜想线段AB、BC、CD三者之间有怎样的等量关系?请写出你的结论并予以证明
(3)再探究:当AE=
AD(
),而其余条件不变时,线段AB、BC、CD三者之间又有怎样的等量关系?请直接写出你的结论,不必证明.
![](https://img.xkw.com/dksih/QBM/2012/5/19/1573382033162240/1573382088892416/STEM/ff269c51-a91c-4aae-9f56-bd29b0cee753.png)
(1)若BK=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b10517f770b668568191d1228f21eb30.png)
(2)连接BE,若BE平分∠ABC,则当AE=
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