已知9^m=6,3^n=2,则3^2m-n的值是

已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= 已知3m=2n,则m/(m+n)+n/(m-n)-n^2/(m^2-n^2)=? 已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) 已知m-n=2 则3m^2-6mn+3n^2-9= 已知(m+n)^2=7,(m-n)^2=3则m^2+n^2 已知m-3n=2m+n-15=1,则m=?,n=? 已知3m+4n+2=4m+3n,则m >n? 已知n分之2m-n=3分之1,则m：（m+n)=____ 已知|6-3m|+(n-5)2=3m-6-根号[(m-3)n2],则m-n= 已知m(m-3)-(m²-3n)=9,则(m²+n²)/2-mn=? 代数 已知2n-m=5.5(m+5)平方+6n-3m-60 已知m^2+9n^2+6m+6n+10=0,求(m^2-6mn+9n^2)/(m-3n)-(4m^2-9n^2)/(2m-3n) 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2m-3n/3m+n=2,求4m-6n/9m+3n+18m+6n/4m-6n的值 已知2m-3n/3m+n=2 求(4m-6n/9m+3n)+(18m+6n/4m-6n)的值.要有步骤和讲解. 已知2m-3n/3m+n=2,求4m-6n/9m+3n+18m+6n/4m-6n的值 已知|2m-n/m+2n|=3,求2（2m-n）/m+2n-2m-n/m+2n-3的值 已知|2m -n/m+2n|=3求2（2m-n）/m+2n-2m-n/m+2n-3的值