(x+y)(x+y-1)-12因式分解

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(x+y)(x+y-1)-12因式分解

(x+y)(x+y-1)-12因式分解
(x+y)(x+y-1)-12因式分解

(x+y)(x+y-1)-12因式分解
(x+y)(x+y-1)-12
=(x+y)[(x+y)-1]-12
=(x+y)²-(x+y)-12
=[(x+y)+3][(x+y)-4]
=(x+y+3)(x+y-4)
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