1) $$rac{7}{12} \cdot \frac{4}{5} + \frac{1}{3} : \frac{5}{6}$$

$$\frac{7}{12} \cdot \frac{4}{5} + \frac{1}{3} : \frac{5}{6} = \frac{7}{12} \cdot \frac{4}{5} + \frac{1}{3} \cdot \frac{6}{5} = \frac{7 \cdot 4}{12 \cdot 5} + \frac{1 \cdot 6}{3 \cdot 5} = \frac{28}{60} + \frac{6}{15} = \frac{28}{60} + \frac{24}{60} = \frac{28+24}{60} = \frac{52}{60} = \frac{13}{15}$$ Ответ: $$\frac{13}{15}$$