3^3*9^m+4/27^2m-1
=3^3*3^2m+8/3^6m-3
=3^(3+2m+8-6m+3)
=3^(14-4m)
729=9x9x9=3^6
14-4m=6
4m=8
m=2
如追加其它问题,