若m²+n²-2m-4n+5=0,求(m+n)²的值
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若m²+n²-2m-4n+5=0,求(m+n)²的值
若m²+n²-2m-4n+5=0,求(m+n)²的值
若m²+n²-2m-4n+5=0,求(m+n)²的值
m²+n²-2m-4n+5=0
(m-1)²+(n-2)²=0
m-1=0
n-2=0
m=1
n=2
(m+n)²=3²=9