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数学
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若P(2x-3y)=9y^2-4x^2,那么求P(-2x-3y）的值
人气：101 ℃ 时间：2019-10-01 14:55:55
解答
P(2X-3Y)=(3Y+2X)(3Y-2X)
P(-2X-3Y)=(3Y-2X)(3Y+2X)=9Y^2-4X^2
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