把多项式2xy-x²-y+1²分解因式的结果是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)
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把多项式2xy-x²-y+1²分解因式的结果是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)把多项式2x
把多项式2xy-x²-y+1²分解因式的结果是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)
把多项式2xy-x²-y+1²分解因式的结果是
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)
把多项式2xy-x²-y+1²分解因式的结果是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-y+1²
=-(x-y)²+1
=（1+x-y）（1-x+y）
所以选A
祝开心