x+y=5,xy=-3,则x^2y+xy^2=____x^2+y^2=________
人气：459 ℃ 时间：2020-06-25 13:12:35
解答
x^2y+xy^2
=xy(x+y)
=-3*5
=-15
x^2+y^2
=(x+y)^2-2xy
=5^2-2*(-3)
=25+6
=31
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