已知m=3x^2+2x-1,n=-x^2-2+3x,求m-2n

已知x^m=1/3,x^n=2,求x^2m+3n 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x^m=3,x^n=6 求 x^m-n,x^3m-2n的值 已知m=3x^2+2x-1,n=-x^2-2+3x,求m-2n 已知:M=3x²+2x-1,N=-x²-2+3x,求M-2N 已知x^2-4x+3=(x-1)^2+m(x-1)+n,求m、n的值 已知集合M={x/3+2x-x^2>0},N={x/x 已知x^2+2x-3=(x+m)^2+n,则m= ,n= 已知x^m=3x^n=2,请计算x^(2m+3n) 已知x^m=3,x^n=6,求x^(3m－2n) 已知4x+1=m(x-2)+n(x-5),求m,n的值 已知(x^2-3x+m)(x-n)=x^3-2x+21,则m=(),n=() 已知集合A={x|x^2-3m+n 已知x的平方-6x+m=(x-2)(x-n),求吗,m,n 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. x^m×(x^n)^3÷[x^(m-1)×2x^(n-1)]= 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N