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(x+2y)(x+3y)+(x-2y)的二次方+(x-3y)的二次方
人气:497 ℃ 时间:2020-04-12 21:20:00
解答
(x+2y)(x+3y)+(x-2y)^2+(x-3y)^2
=x^2+5xy+6y^2 +x^2-4xy+4y^2 +x^2-6xy+9y^2
=3x^2-5xy+19y^2
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