解:因为2^(3m-2n)=(2^m*2^m*2^m)/(2^n*2^n)=3×3×3/(4×4)=27/16
27/4因为啊啊 a^(m-n)=a^m/a^n...还有个 a^rs =(a^r)^s!!!楼上公式用错了吧。。a^r*a^s==a^(r+s)
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