-2的相反数是 .
考点分析:
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如图所示,在对角线长分别为12和16的菱形ABCD中,E、F分别是边AB、AD的中点,H是对角线BD上的任意一点,则HE+HF的最小值是( )
A.14
B.28
C.6
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如图,A、B、C三点在正方形网格线的交点处,若将△ABC绕着点A逆时针旋转得到△AC′B′,则tanB′的值为( )
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A.
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B.
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D.
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不等式组
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A.x>1
B.x<2
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如图所示的几何体是由一些小立方块搭成的,则这个几何体的俯视图是( )
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D.
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