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(3x-y)(y+3x)-2(4x-3y)(4x+3y)
人气:278 ℃ 时间:2020-04-02 19:28:14
解答
(3x-y)(y+3x)-2(4x-3y)(4x+3y)
=9x^2-y^2-2(16x^2-9y^2)
=9x^2-y^2-32x^2+18y^2
=17y^2-23x^2
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