题目内容
把多项式2xy-x2-y2+1分解因式是( )
A.(x-y+1)(y-x+1) | B.(x-y-1)(y-x+1) | C.(x-y-1)(x-y+1) | D.(x-y+1)(x-y+1) |
2xy-x2-y2+1=-(x-y)2+1=(x-y+1)(y-x+1).
故选A.
故选A.
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