x+y=-3 xy=-2 那么x的三次方y²+x²y三次方=________

问题描述:

x+y=-3 xy=-2 那么x的三次方y²+x²y三次方=________

x³y²+x²y³
=x²y²(x+y)
=(xy)²(x+y)
=(-2)²*(-3)
=4*(-3)
=-12