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x+y=4,xy=2,2x^3y+4x^2y^2+2xy^3
人气:238 ℃ 时间:2020-01-19 20:32:54
解答
2x^3y+4x^2y^2+2xy^3
=2xy(x^2+2xy+y^2)
=2xy(x+y)^2
=2*2*4^2
=64
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