9. log210 log29 +log,0,1

9. $$\frac{\log_2 10}{\log_2 9} + \log_9 0.1 = \log_9 10 + \log_9 \frac{1}{10} = \log_9 (10 \cdot \frac{1}{10}) = \log_9 1 = 0$$

Ответ: 0