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(x+2y)^2-(x+y)(3x-y)-5y^2
人气:391 ℃ 时间:2020-07-20 12:36:06
解答
(x+2y)^2-(x+y)(3x-y)-5y^2
=(x^2+4xy+4y^2)-(3x^2+2xy-y^2)-5y^2
=-2x^2+2xy
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