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数学
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(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
人气:182 ℃ 时间:2020-02-04 06:36:32
解答
(x+3y)^2-2(x+3y)(4x-3y)+(4x-3y)^2
=[(x+3y)-(4x-3y)]²
=(-3x+6y)²
=9x²-36xy+36y²
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