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(-3xy)(5x²y)+6x平方(2/7xy²-2y²)
人气:280 ℃ 时间:2019-10-11 03:28:20
解答
(-3xy)(5x²y)+6x平方(2/7xy²-2y²)
=-15X^3Y^2+12/7X^3Y^2-12X^2Y^2
=-93/7X^3Y^2-12X^2Y^2
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