解由题知单项式9a^(m+1)*b^(n+1)与-2a^(2m-1)*b^(2n+1)的积为-18a^(3m)*b^(3n+2)
即-18a^(3m)*b^(3n+2)与5a^3*b^6是同类项
即3m=3,3n+2=6
解得m=1,n=4/3.