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(x+y)(x-1)-xy-y^2 怎么因式分解?
人气:397 ℃ 时间:2020-04-25 19:16:30
解答
(x+y)(x-1)-xy-y^2
=x^2-x+xy-y-xy-y^2
=(x^2-y^2)-(x+y)
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
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