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如图,△ABC与△A′B′C′是位似图形,且位似比是1:2,若AB=2cm,则A...
如图,△ABC与△A′B′C′是位似图形,且位似比是1:2,若AB=2cm,则A′B′=
cm,请在图中画出位似中心O.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160712041213950/SYS201310221607120412139010_ST/images0.png)
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点A(-1,y
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上,则y
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如图,将边长为2cm的正方形ABCD沿其对角线AC剪开,再把△ABC沿着AD方向平移,得到△A′B′C′,若两个三角形重叠部分的面积为1cm
2,则它移动的距离AA′等于( )
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A.0.5cm
B.1cm
C.1.5cm
D.2cm
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如图,AB是⊙O的直径,CD是弦,且CD⊥AB,若BC=8,AC=6,则sin∠ABD的值为( )
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A.
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B.
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C.
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D.
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小明根据下表,作了三个推测:
x | 1 | 10 | 100 | 1000 | 10000 | … |
6+![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160712041213950/SYS201310221607120412139005_ST/0.png) | 7 | 6.1 | 6.01 | 6.001 | 6.0001 | •• |
①6+
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(x>0)的值随着x的增大越来越小;
②6+
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(x>0)的值有可能等于6;
③6+
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(x>0)的值随着x的增大越来越接近于6.其中,推测正确的有( )
A.3个
B.2个
C.1个
D.0个
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