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化简:(x-y)(x-2y)+(x+2y)(x-3y)
人气:477 ℃ 时间:2020-01-29 18:35:34
解答
(x-y)(x-2y)+(x+2y)(x-3y)
=x^2-2xy-xy+2y^2+x^2-3xy+2xy-6y^2
=2x^2-4xy-4y^2.
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