Вычисли значения выражений: 3 4/7 * 9 16/17 + 3 4/7 * 7 1/17 и 9 3/4 * 10 15/26 - 10 4/13 * 9 3/4.

1. $3\frac{4}{7} \cdot 9\frac{16}{17} + 3\frac{4}{7} \cdot 7\frac{1}{17} = 3\frac{4}{7} \cdot (9\frac{16}{17} + 7\frac{1}{17}) = 3\frac{4}{7} \cdot (9 + 7 + \frac{16}{17} + \frac{1}{17}) = 3\frac{4}{7} \cdot (16 + \frac{17}{17}) = 3\frac{4}{7} \cdot 17 = \frac{3 \cdot 7 + 4}{7} \cdot 17 = \frac{25}{7} \cdot 17 = \frac{25 \cdot 17}{7} = \frac{425}{7} = 60\frac{5}{7}$. 2. $9\frac{3}{4} \cdot 10\frac{15}{26} - 10\frac{4}{13} \cdot 9\frac{3}{4} = 9\frac{3}{4} \cdot (10\frac{15}{26} - 10\frac{4}{13}) = 9\frac{3}{4} \cdot (10 - 10 + \frac{15}{26} - \frac{4}{13}) = 9\frac{3}{4} \cdot (\frac{15}{26} - \frac{4 \cdot 2}{13 \cdot 2}) = 9\frac{3}{4} \cdot (\frac{15}{26} - \frac{8}{26}) = 9\frac{3}{4} \cdot \frac{7}{26} = \frac{9 \cdot 4 + 3}{4} \cdot \frac{7}{26} = \frac{39}{4} \cdot \frac{7}{26} = \frac{3 \cdot 13}{4} \cdot \frac{7}{2 \cdot 13} = \frac{3}{4} \cdot \frac{7}{2} = \frac{3 \cdot 7}{4 \cdot 2} = \frac{21}{8} = 2\frac{5}{8}$. **Ответ:** 1. $60\frac{5}{7}$ 2. $2\frac{5}{8}$