已知X+Y＝6,XY＝－6,求代数式X＾3Y+XY＾3

网友回答

x^3y+xy^3
=xy(x^2+y^2)
=xy[(x+y)^2-2xy]
=-6*[6^2-2*(-6)]
=-288======以下答案可供参考======
供参考答案1:
X＾3Y+XY＾3=xy(x^2+y^2)
=xy[(x+y)^2-2xy]
=-6[6^2-2*(-6)]
=-288