已知x-y=3,xy=2,求x^3y-2x^2y^2+xy^3的值.
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已知x-y=3,xy=2,求x^3y-2x^2y^2+xy^3的值.
已知x-y=3,xy=2,求x^3y-2x^2y^2+xy^3的值.
已知x-y=3,xy=2,求x^3y-2x^2y^2+xy^3的值.
x^3y-2x^2y^2+xy^3
=xy(x^2-2xy+y^2)
=xy(x-y)^2
=2*3^2
=18
x^3y-2x^2y^2+xy^3=xy(x-y)^2=2*3^2=18
老兄,这个 ^ 符号什么意思?
原式= xy(x^2+y^2)-2x^2y^2
= xy[(x+y)^2+2xy]-2x^2y^2
带入数值
最后等于18
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