一减x的平方加2xy减y的平方 因式分解

2025-03-07 06:51:09
推荐回答(1个)
回答1:

1-x^2+2xy-y^2
=1-(x^2-2xy+y^2)
=1-(x-y)^2
=[1-(x-y)][1+(x-y)]
=(1-x+y)(1+x-y)