{3m-4n=7 9m-10n+25=0用代入法

3m-4n=7 9m-10n+25=0 求mn 解方程组：｛ 3m-4n=-7 9m-10n+25=0 {3m-4n=7 9m-10n+25=0用代入法 .4（m+n)^2*（m+n)^3-7（m+n)（m+n)^4+5（m+n)^5= m/n=7/3则m+n/m-n 求方程组 3m-4n=7 9m-10n+23=0 如果m-3n+4=0 求(m-3n)^2+7m^3-3(2m^3n-m^2n-1)+3(m^3+2m^3n-m^2n+n 已知m^2+9n^2+6m+6n+10=0,求(m^2-6mn+9n^2)/(m-3n)-(4m^2-9n^2)/(2m-3n) 以知m^2+9n^2+6m+6n+10=0,求(m^2-6mn+9n^2)除以(m-3n)-(4m^2-9n^2)除以(2m-3n)的值 已知m^2+9n^+6m+6n+10=0,求(m^2-6mn+9n^2)÷(m-3n)-(4m^2-9n^2)÷(2m-3n)的值 已知(4M-5N+17)*(4M-5N+17)+(7M-3N+1)*(7M-3N+1)=0,求M,N的值 m-[n-3m-(m-n)]=? 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= |m-n|=n-m,且|m|=4,|n|=3,则m+n=? m*m+n*n-6m+10n+34=0,求m+n的值 (m-2n)(2n+m)-(-3m-4n)(4n-3m)= |m-4|+|n+3|=0则m-n= 解方程3m+5n+9=4m-2n-7 求n=