若|x+y-1|+(y+3)2=0,则x-y的值为______

若|x+y-1|+(y+3)2=0,则x-y的值为______.
2025-04-25 21:56:38
推荐回答(1个)
回答1:

∵|x+y-1|+(y+3)2=0,

x+y?1=0
y+3=0

解得
x=4
y=?3

∴x-y=4-(-3)=7.