分解因式:2x2-8= .
考点分析:
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有意义,则a的取值范围为
.
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如图,正方形ABCD中,E是BC边上一点,以E为圆心、EC为半径的半圆与以A为圆心,AB为半径的圆弧外切,则sin∠EAB的值为( )
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A.
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B.
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C.
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D.
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二元一次方程x-2y=1有无数多个解,下列四组值中不是该方程的解的是( )
A.
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B.
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C.
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D.
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抛物线y=x
2-2x+1的顶点坐标是( )
A.(1,0)
B.(-1,0)
C.(-2,1)
D.(2,-1)
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如图.矩形纸片ABCD中,已知AD=8,折叠纸片使AB边与对角线AC重合,点B落在点F处,折痕为AE,且EF=3.则AB的长为( )
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A.3
B.4
C.5
D.6
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