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已知X+y=6,xy=7 求x^2y+xy^2=
已知X+y=6,xy=7 x^2y+xy^2
人气:373 ℃ 时间:2020-04-12 04:15:31
解答
x^2y+xy^2
=xy(x+y)
=7x6
=42��(x+1)^2=13 ��x^2+2x+3=x^2+2x+3=(x+1)^2+2=13+2=15
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