下列各因式分解正确的是( )
A.x2+2x-1=(x-1)2 |
B.-x2 +(-2)2 =(x-2)(x+2) |
C.x3-4x = x(x+2)(x-2) |
D.(x+1)2 = x2+2x+1 |
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下列各因式分解正确的是( )
A.x2+2x-1=(x-1)2 |
B.-x2 +(-2)2 =(x-2)(x+2) |
C.x3-4x = x(x+2)(x-2) |
D.(x+1)2 = x2+2x+1 |
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