2的m次方等于3,2的n次方等于4,2的3m减2n次方即2的3m次方除以2的2n的次方,即(2的m次方*2的m次方*2的m次方)/(2的n次方*2的n次方),即(3*3*3)/(4*4)=27/16
27/16
2^(3m-2n)=2^3m/2^2n=(2^m)^3/(2^n)^2=3^3/4^2=27/16
2的m次方等于3,则2的3m次方等于3的3次方,等于27,同理2的n次方等于4,2的2n次方等于16,所以结果是27/16