（6^4*8^2）/(3^2*2^3*2^4)=((2*3)^4*(2^3)^2)/(2^3*3^2*2^4)=(2^4*3^4*2^6)/(2^3*3*2*2^4)=(2^4*2^6/2^3*2^4)*(3^4/3^2)=8*9=72