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如图,小“鱼”与大“鱼”是位似图形,已知小“鱼”上一个“顶点”的坐标为(a,b)...
如图,小“鱼”与大“鱼”是位似图形,已知小“鱼”上一个“顶点”的坐标为(a,b),那么大“鱼”上对应“顶点”的坐标为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164825771005280/SYS201310221648257710052003_ST/images0.png)
A.(-a,-2b)
B.(-2a,-b)
C.(-2a,-2b)
D.(-2b,-2a)
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A.
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B.
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C.
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D.
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B.
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D.
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如图,已知AB为⊙O的直径,点C在⊙O上,∠C=15°,则∠BOC的度数为( )
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