若| x-1| +2|y+3 |=0,则x+y的值是多少
问题描述:
若| x-1| +2|y+3 |=0,则x+y的值是多少
答
| x-1| +2|y+3 |=0
x-1=0,y+3=0
x=1,y=-3
x+y=1-3=-2