m
原式= m(m−n)+n(m+n)−m2 (m+n)(m−n) = n2 (m+n)(m−n), 又3m=4n, 则m= 4 3n, 则原式= n2
7n 3• 1 3n= 9 7. 故答案为 9 7.
已知3m=4n,则mm+n+nm−n−m
已知M+N=4分之3,m-n=四分之一 m^2-2nm+3m+3n+n^2
已知丨m-2丨+(n+5/1)²=0,求m-(m²n+3m-4n)+3(2nm²-3n)的
已知m+n=3/4.m-n=1/4,求m^2+nm-3m-3n的值
已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=?
化简m-(m^2×n+3m-4n)+(2nm^2-3n)
已知m²+n²=10,m*n=4,则代数式-m^3n-n^3m=
已知2m+n分之m-2n=3,则2m+n分之3(m-2n)+3(2m+n)分之m-2n-4(2m+n)分之5(m-2n)
1,已知3m=4n,则m/m+n +n/m-n -m^2/m^2-n^2=
已知m+n=四分之三,m-n=四分之一,求m^2+nm-3m-3n的值
化简:mm−n−nm+n+2mnm
已知2x²与3xy²是同类项,计算m-(m²n+3m-4n)+(2nm²-3n)
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