Question

[数学题]若|x+1|+(x-y+3)^2=0,则(x+y)^2的值是?(4个答案选择)

Answer 1

|x+1|>=0

(x-y+3)^2>=0

所以x+1=0

x-y+3=0

所以x=-1

y=2

所以(x+y)^2=1

选B