神马作文网3xny4与-x3ym是同类项，则2m-n=______．
若单项式3x2yn与-2xmy3是同类项，则m+n=______．
当m=______，n=______时，2xmy3与-3xy3n是同类项．
单项式3xm+2ny8与-2x2y3m+4n是同类项，则m+n=______．
已知代数式2a3bn+1与-3am+2b2是同类项，则2m+3n=______．
已知代数式2a3bn+1与-3am-2b2是同类项，则m+2n=______．
2a5bn+2与-9am+nb5是同类项．求2m-3n=______．
单项式3x^m+2 y^7与-2x^4 y^2m+3n是同类项,则m+n=______
若2003xn+7与2004x2n+3是同类项，则n=______．
已知单项式-5x3yn与5xm+1y3是同类项，则m-n的值为______．
如果2x的3m-1次方y的4次方与-3x的8次方y的2n次方是同类项,则m=___,n=______.
如果单项式5a^（m+2）b^（2n-3）与-2a^（n+1）b^(3m-2)是同类项,则m=?n?
若(3x*m+2n)y*8与(-2x*2)y*3m+4n是同类项,则m+n=?