Biểu thị lôgarit sau đây theo lôgarit thập phân (rồi cho kết quả bằng máy tính. làm tròn đến chữ số thập phân thứ hai):
$\log_725;    \log_58;    \log_90,75;    \log_{0,75}1,13$
$\log_725 = \frac{\log25}{\log7} \approx 1,65 $                                       $   \log_58 = \frac{\log8}{\log5} \approx 1,29 $
$\log_90,75 = \frac{\log0,75}{\log9} \approx - 0,13$                             $  \log_{0,75}1,13 = \frac{\log 1,13}{\log0,75}\approx -0,42 $

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