若|m-3|+(n-2)²=0,求3m+2n的值.要正确.越快越好
若2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
已知|2m-n/m+2n|=3,求2(2m-n)/m+2n-2m-n/m+2n-3的值
若m-n=3,3m+2n=2,求代数式6m(m-n)-4n(n-m)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
|m-5|+(n+3)²=0,求m²- n²+2m-5n的值
若|m-n|+(m+2n-3)²=0,则m+n的值是
已知:3m-5n=0,求m/(m+n)+m/(m-n)-m^2/(m^2-n^2)的值
已知3m-5n=0求m/m+n+m/m-n-m^2/m^2-n^2的值
已知m/n=5、,求(m/(m+n))+(m/(m-n))-(n^2/(m^3-n^2))
诺2m-n/m+2n=5,求3(2m-n)/m+2n-m+2n/2m-n+3的值
当m-n/m+n=3时,求代数式(3m+3n/m-n)-(m-n/m+n)^2的值为多少?