x+y=0 求x3+x2y+xy2+y3的值
问题描述:
x+y=0 求x3+x2y+xy2+y3的值
答
x3+x2y+xy2+y3
=x*x(x+y)+y*y(x+y)
=0
答
原式=x²(x+y)+y²(x+y)
=0+0
=0