计算
(1)(-a4b2) 3·(-a2b3) 2;
(2)(-xmyn) 2·(xm-1yn-1) 3.
(3)
计算:=________.
计算= ________________.
若a3=-27x9y3z6,则a=______;若a2=4x2y4,则a=______.
已知10m=2,10n=3,则103m+2n=_________
若3x=27,2y=32,则2x+3y=______.