若x,y满足|x-y+1|+(x+y+3)2=0,则x2-y2=______

若x,y满足|x-y+1|+(x+y+3)2=0,则x2-y2=______.
2025-04-19 15:57:19
推荐回答(1个)
回答1:

∵|x-y+1|+(x+y+3)2=0,

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

解得:
x=?2
y=?1

∴x2-y2=(x+y)(x-y)=(-2-1)×(-2+1)=3.
故答案为:3.