m^2+4m+n^2-6n+13=0,则m+n=

问题描述:

m^2+4m+n^2-6n+13=0,则m+n=

m^2+4m+n^2-6n+13=0
m^2+4m+4+n^2-6n+9=0
(m+2)^2+(n-3)^2=0
所以
m=-2 n=3
m+n=-2+3=1