若|m+n-5|+(2m+3n-5)²=0 求(m+n)²的值
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若|m+n-5|+(2m+3n-5)²=0 求(m+n)²的值
若|m+n-5|+(2m+3n-5)²=0 求(m+n)²的值
若|m+n-5|+(2m+3n-5)²=0 求(m+n)²的值
由题意得
m+n-5=0
2m+3n-5=0
解得n=-5,m=10,
∴(m+n)²=(10-5)²=25