已知m=3x-2,n=-2x+3求使m-2n=0

已知x^m=3,x^n=6 求 x^m-n,x^3m-2n的值 已知x^m=1/3,x^n=2,求x^2m+3n 已知x^m=2,x^n=3(m、n是正整数),求:(1)x^2m=3n;(2)x^2m+x^3n. 已知,单项式M,N满足2x(M+3x)=6x^2y^2+N,求M,N. 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知x^m=2,x^n=5.(1)x^m+n、x^m-n的值；（2）求x^3m-2n的值 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知根号m,根号n是方程x^2-3x+1=0的两个根,求m*根号m-n*根号n/根号m-根号n 已知根号m,n是方程x^2-3x+1=0俩个根,求(m根号m-n根号n)/(根号m-根号n)的值 已知（m+2)x^2+3x^（m+(1/3)n)=0是一元一次方程,求m、n的值 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N