使
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有意义的x的取值范围是
.
考点分析:
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用配方法解方程:x
2-4x+2=0,下列配方正确的是( )
A.(x-2)
2=2
B.(x+2)
2=2
C.(x-2)
2=-2
D.(x-2)
2=6
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下列说法正确的是( )
A.所有的菱形都相似
B.所有的矩形都相似
C.所有的正方形都相似
D.所有的梯形都相似
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如图,△ABC中,∠C=90°,AB=5,AC=3,则sinB=( )
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