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如图,已知∠ACB=∠CBD=90°,BC=a,AC=b,当CD=( )时,△C...
如图,已知∠ACB=∠CBD=90°,BC=a,AC=b,当CD=( )时,△CDB∽△ABC.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268007_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268007_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268007_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268007_ST/3.png)
考点分析:
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如图,每个小正方形边长均为1,则下列图中的三角形(阴影部分)与左图中△ABC相似的是( )
A.
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B.
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C.
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D.
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如果方程组
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只有一个实数解,那么m的值为( )
A.
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B.
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C.-1
D.0
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一个不透明的布袋里装有3个红球、2个白球,每个球除颜色外其它均相同,搅拌均匀后从中任意摸出一个球,则摸出的球是红球的概率是( )
A.
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B.
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C.
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D.
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如图,△ABC中,∠C=90°,AC=16cm,AB的中垂线MN交AC于点D,连接BD,若cos∠BDC=
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,则BC=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268003_ST/images1.png)
A.8cm
B.4cm
C.6cm
D.10cm
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已知二次根式
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000527523326825/SYS201311030005275233268002_ST/0.png)
与
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是同类二次根式,则a的值可以是( )
A.5
B.3
C.7
D.8
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