如图,在
中,
为
的平分线,点
在
边上,点
在
边上,
,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b80f6162fd1dbff226cfcb0f07f5c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d651d3479abe85ec51559f2f0a3e2ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2889366f2ba788e6f865fcd7645a268d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16283fc4e6399aa8e0ce5fcd13e59014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6099933be0329484b20e85b8d7011a1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d87448e09eaa816e50ae92d111d5ded6.png)
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084766984511488/2136400173924352/STEM/c8bcc41190a34a76bf5492ceddfd8457.png?resizew=111)
更新时间:2019-02-08 19:40:11
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【推荐1】如图,AD是△ABC的中线,E是AD上一点,且AE:ED=2:3,CE延长∠AB于F,若AF=3cm,求AB的长.
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【推荐2】如图,在△OAB中,O为坐标原点,横、纵轴的单位长度相同,A、B的坐标分别为(8,6),(16,0),点P沿OA边从点O开始向终点A运动,速度每秒1个单位,点Q沿BO边从B点开始向终点O运动,速度每秒2个单位,如果P、Q同时出发,用t(秒)表示移动时间,当这两点中有一点到达自己的终点时,另一点也停止运动.求:
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![](https://img.xkw.com/dksih/QBM/2012/9/24/1573525635809280/1573525666316288/STEM/928b9920487445f0a6acc1e73b83bd31.png?resizew=208)
(1)几秒时PQ∥AB.
(2)设△OPQ的面积为y,求y与t的函数关系式.
(3)△OPQ与△OAB能否相似?若能,求出点P的坐标,若不能,试说明理由.
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解答题-问答题
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【推荐1】如图,矩形
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57d0e6f0039ea0260a9dd123c25eda94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6a0c85deb80d8e63bc60127e803f7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
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名校
【推荐2】如图,在
中,
为
上一点,以
为圆心,
长为半径作圆,与
相切于点
,过点
作
交
的延长线于点
,且
.
(1)求证:
为
的切线;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b2329aa180097615d0a7ea2adc4d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12d8da10b2137a1e87801556a313e625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d08546f44e36a5f119e8c0cdf85f3d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0880fcd038a82649d0e55227c576362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba8357fca16e3bab19701e22db1b0229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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