题型:解答题
难度:0.65
引用次数:278
题号:8139441
如图△ABC中,∠ABC=90°,CD平分∠ACB交AB于点D,以点D为圆心,BD为半径作⊙D交AB于点E.
(1)求证:⊙D与AC相切;
(2)若AC=5,BC=3,试求AE的长.
(1)求证:⊙D与AC相切;
(2)若AC=5,BC=3,试求AE的长.
![](https://img.xkw.com/dksih/QBM/2019/5/22/2209076762820608/2209729547075584/STEM/e348b99886e54d4d8adc2282b75ba468.png?resizew=136)
更新时间:2019-05-29 20:54:21
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解答题-证明题
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适中
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【推荐1】完成下面的证明:
已知:如图,
,CD平分
,EF平分
.
求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/bb9dc5e4-6359-40e6-9dcd-5d56660f464a.png?resizew=195)
证明:∵
,
∴
___________( ).
∵CD平分
,EF平分
,
∴∠1=__________,∠2=_________.
∴∠___________=∠_____________.
∴
(___________________________).
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/bb9dc5e4-6359-40e6-9dcd-5d56660f464a.png?resizew=195)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43defd54316aac92a3d18d4d400033c2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a72f1612190b1cac749477321a9c457.png)
∵CD平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6beda2518cf76da94d7ec9a813dcfa82.png)
∴∠1=__________,∠2=_________.
∴∠___________=∠_____________.
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9390a8688fd466fb6b883b0d60dcd872.png)
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【推荐2】如图,
是
的角平分线,
,交
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解答题-问答题
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【推荐1】在Rt△ABC中,∠ACB=90°,BC=30,AB=50.点P是AB边上任意一点,直线PE⊥AB,与边AC或BC相交于E.点M在线段AP上,点N在线段BP上,EM=EN,sin∠EMP=
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(1)如图1,当点E与点C重合时,求CM的长;
(2)如图2,当点E在边AC上时,点E不与点A、C重合,设AP=x,BN=y,求y关于x的函数关系式,并写出x的取值范围;
(3)若△AME∽△ENB,求AP的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5756451881af4d6594c820652ebcc2a.png)
(1)如图1,当点E与点C重合时,求CM的长;
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【推荐2】如图,正方形ABCD中,M为BC上一点,F为AM上一点,EF⊥AM,垂足为F,交AD的延长线于点E,交DC于点N.
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(2)如果F是AM的中点且AB=12,BM=5,求CN的长.
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【推荐1】如图,在△ABC中,AB=BC,以BC为直径的⊙O交AC于点D,过点D作DE⊥AB,DF⊥BC,垂足分别为E、F.
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【推荐2】如图,点P是外一点,
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【推荐1】如图,以AB为直径作
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的切线;
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
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【推荐2】如图,
为
的直径,
切
于点
与
的延长线交于点
交
延长线于点
,连接
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求证:
是
的切线.
若
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