已知:(x+m)(x+n)=x^2-6x+8,则2mn-3m-3n=

已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求MN 已知:单项式mn满足2x(M+3x)=6x²y²+N,求MN 已知x^m=3,x^n=6 求 x^m-n,x^3m-2n的值 已知单项式M,N满足3x(M-5x）=6x²y²+N,求MN. 已知单项式M,N满足等式3x(M-5x)=6x平方y3次方+n,求MN 若x^m=6,x^n=9,则(2x^3m*x^2n) / (x^m*x^n)^2*x^n x^2-5x+6可分解因式为(x+m)(x+n),则mn=( ) 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,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知mn^2=-5,求-mn(m^3n^7-m^2n^5-n)的值 已知2x的3m+1次方y的2n次方与6x的n-6次方