若3m-4n=0 则m:n=____:____如标题...

若3m-4n=0 则m:n=____:____如标题... 若|m+3|+m²-mn+1/4n²=0,则m=____,n=____ 若实数m,n满足m^2+n^2-4m-14n+45=0,则k=(n-3)/(m+2)的最大值为____. 若m+n=0,n=-3则m=_ (m-n):n=2:3则m:n=_:_ 若m×m+n×n-6n+4m+13=0,则m×m-n×n=? |m-2|+n²-8n+16=0,则m=____,n=____. 如果m+n=2 1/3,m-n=3 1/2,则4(n-m)=____.2-3/7m-3/7n=____. 7m=5n,则m:n=_ 已知n分之2m-n=3分之1,则m：（m+n)=____ 若3x^(m+2n-3)-4y^(2m+3n-6)+5=0是关于的二元一次方程,则m=_,n=_ 若M=－5a+3b,N=2a－7b,则M+N=_,M－N=_. 设实数m,n满足m^2n^2-2n+8m+17=0,则n=_,m=_ 已知3m=4n,则m/m+n+n/m-n-m^2/m^2-n^2= 若3^m*3^n=1,则m+n=____? 若m,n互为相反数,则（3m-2n）-(2m-3n)=——————-{-[-（a+b）]}+{-[-(a-b)]}=__+5a^2bc=-10a^2bc如果1/5x^3y^m+ax^ny^4=0,则m=_,n=_,a=_ |m-n|=n-m,且|m|=4,|n|=3,则m+n=? |m-4|+|n+3|=0则m-n=