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数学
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-1/2(4xy-8x^2y^2)+1/3(xy-6x^2y^2)
人气:153 ℃ 时间:2020-10-01 21:43:31
解答
-1/2(4xy-8x^2y^2)+1/3(xy-6x^2y^2)
=-2xy+4x²y²+1/3xy-2x²y²
=(1/3-2)xy+(4-2)x²y²
=-5/3xy+2x²y²
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