已知m=x^3+3x^2+6x-1 ,n=2x^2+3x-1则x^3-x^2+1=?已知a^2+b^2=8 (a-b)^2=9 则ab为

已知x^m=3,x^n=6 求 x^m-n,x^3m-2n的值 已知x^m=3,x^n=6,求x^(3m－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)=6x^2y^2+N,求M、N. 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知x^m=6^-1,x^n=1/3^-1,求x^3m+2n的值 已知:(x+m)(x+n)=x^2-6x+8,则2mn-3m-3n= 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^m=9,x^n=6,x^k=2,求x^m+2n+3k 已知x^m=9,x^n=6,x^k=2,求x^m+2n+3k 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 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N 已知x^m=3x^n=2,请计算x^(2m+3n) 已知x^2+2x-3=(x+m)^2+n,则m= ,n=