计算|-1|+(-2)2= .
考点分析:
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D.
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如图,将△ABC绕点C(0,-1)旋转180°得到△A'B'C,设点A的坐标为(a,b),则点A′的坐标为( )
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方程x
2-3=0的根是( )
A.x=3
B.x
1=3,x
2=-3
C.
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D.
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