m^2+4m+n^2-6n+13=0,则m+n=

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m^2+4m+n^2-6n+13=0,则m+n=m^2+4m+n^2-6n+13=0,则m+n=m^2+4m+n^2-6n+13=0,则m+n=m^2+4m+n^2-6n+13=0m^2+4m+4+n

m^2+4m+n^2-6n+13=0,则m+n=
m^2+4m+n^2-6n+13=0,则m+n=

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

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

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

m^2+4m+n^2-6n+13=0
即:(m+2)^2+(n-3)^2=0
那么,m+2=0,m=-2
n-3=0,n=3
所以,m+n=-2+3=1