分解因式:2xy-x2-y2+1有过程!

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分解因式:2xy-x2-y2+1有过程!分解因式:2xy-x2-y2+1有过程!分解因式:2xy-x2-y2+1有过程!2xy-x2-y2+1=1-(x2-2xy+y2)=1-(x-y)2=(1-x+

分解因式:2xy-x2-y2+1有过程!
分解因式:2xy-x2-y2+1有过程!

分解因式:2xy-x2-y2+1有过程!
2xy-x2-y2+1
=1-(x2-2xy+y2)
=1-(x-y)2
=(1-x+y)(1+x-y)