(2009•上海)分母有理化:
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=
.
考点分析:
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(2009•上海)如图,已知AB∥CD∥EF,那么下列结论正确的是( )
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A.
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B.
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C.
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D.
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(2009•上海)下列正多边形中,中心角等于内角的是( )
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B.正五边形
C.正四边形
D.正三边形
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(2009•上海)抛物线y=2(x+m)
2+n(m,n是常数)的顶点坐标是( )
A.(m,n)
B.(-m,n)
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D.(-m,-n)
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(2009•上海)用换元法解分式方程
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+1=0时,如果设
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=y,将原方程化为关于y的整式方程,那么这个整式方程是( )
A.y
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B.y
2-3y+1=0
C.3y
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D.3y
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(2009•上海)不等式组
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的解集是( )
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