(x+y)(x-y)-(x+y)平方 因式分解

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(x+y)(x-y)-(x+y)平方因式分解(x+y)(x-y)-(x+y)平方因式分解(x+y)(x-y)-(x+y)平方因式分解=(x+y)[(x-y)-(x+y)]=(x+y)(x-y-x-y)

(x+y)(x-y)-(x+y)平方 因式分解
(x+y)(x-y)-(x+y)平方 因式分解

(x+y)(x-y)-(x+y)平方 因式分解
=(x+y)[(x-y)-(x+y)]
=(x+y)(x-y-x-y)
=-2y(x+y)

原式=(x+y)(x-y-1)