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-2008
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考点分析:
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如图,把边长为3的正三角形绕着它的中心旋转180°后,重叠部分的面积为( )
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A.
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B.
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C.
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D.
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如图所示,圆O的弦AB垂直平分半径OC,则四边形OACB( )
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A.是正方形
B.是长方形
C.是菱形
D.以上答案都不对
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⊙O的半径为4,圆心O到直线l的距离为3,则直线l与⊙O的位置关系是( )
A.相交
B.相切
C.相离
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m是方程x
2+x-1=0的根,则式子m
3+2m
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A.2007
B.2008
C.2009
D.2010
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将一元二次方程x
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A.(x-2)
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B.(x-1)
2=2
C.(x-1)
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D.(x-2)
2=3
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