已知|3-y|+|x+y|=0,求xy分之x-y的值
问题描述:
已知|3-y|+|x+y|=0,求xy分之x-y的值
答
x=-3,y=3
(x-y)/xy=2/3
已知|3-y|+|x+y|=0,求xy分之x-y的值
x=-3,y=3
(x-y)/xy=2/3