a^m*b^(n+6)与5a^(2n+1)*b^(3m+3)是同类项
则m=2n+1(1)
n+6=3m+3 n+3=3m(2)
(1)+(2)*2m+6=1+6mm=1
代入(1) n=0
则m-2005n=1