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