已知(2x-5y)(3x+y)=6x²+m+n NM为单项式求M-N的值

已知单项式3x^(2n-3)×y^(m+1)与单项式5x^5×y^(7-m)的和仍为单项式,求m,n的值 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知M.N分别表示不同的单项式,且3x(M-5x)=6x*x*y*y*y+N,求M,N 已知单项式M N满足3x(M-5x)=6x^2y^2 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)=6x^2y^2+N,求M、N. 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 已知单项式3X^N+1 Y⁴与½x³y^m-2是同类式,求3.5n²m+2nm 已知单项式M,N满足3x(M-5x）=6x²y²+N,求MN. 已知M,N分别表示不同的单项式,且3x(M-5x)=6x的2次方+y的三次方+N.求M,N 已知:单项式M,N满足2x(M+3x)=6x^2y^2+N,求M,N的值. 一道 （已知M,N分别表示不同的单项式,且3x（M-5x）=6x?2y?3+N.求M,N.