[数学题]若|x+1|+(x-y+3)^2=0,则(x+y)^2的值是?(4个答案选择)
问题描述:
[数学题]若|x+1|+(x-y+3)^2=0,则(x+y)^2的值是?(4个答案选择)
若|x+1|+(x-y+3)^2=0,则(x+y)^2的值是?(4个答案选择)
A.0
B.1
C.9
D.4
答
|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