Câu 29:

Cho $x=2018!.$ Tính $A=\frac{1}{{{\log }_{{{2}^{2018}}}}x}+\frac{1}{{{\log }_{{{3}^{2018}}}}x}+\,...\,+\frac{1}{{{\log }_{{{2017}^{2018}}}}x}+\frac{1}{{{\log }_{{{2018}^{2018}}}}x}.$