若3×9m×27m=321,则m=____;若1284×83=2n,则n=____.
[(a2)3]4=____;(-x5)4+(-x4)5=____;(-a3)5·(-a2)3=____;2m·4n=______.
若x3n=5,y2n=3,则x6ny4n=____.
若a2n=9,则a6n=____.
a12=(____)6=(____)4=(____)3=(____)2.
(103)6=_______;(-a2)5=________;(-mn)4=________;(a3)2·(a2)4=_______.