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数学
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计算 (2x-y)(2x+y)-(2y+x²)(2y-x²)
人气:469 ℃ 时间:2019-11-11 00:40:56
解答
=4x^2-y^2-4y^2+x^4
=4x^2-5y^2+x^4
=x^4+4x^2-5y^2
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