2^3x = 2^(3*log(2) 3)
= [2^log(2) 3]^3
= 3^3
采用以上方法对上式进行简化可以得到:
原式= (3^3 - 1/3^3)/(3-1/3)
= (27-1/27)/(8/3)
= (728/27)/(8/3)
= 91/9
2^3x = 2^(3*log(2) 3)
= [2^log(2) 3]^3
= 3^3
采用以上方法对上式进行简化可以得到:
原式= (3^3 - 1/3^3)/(3-1/3)
= (27-1/27)/(8/3)
= (728/27)/(8/3)
= 91/9