2. Выполните действия: 12+3\frac{3}{8}-1\frac{5}{6}; 7\frac{8}{15}+(5\frac{7}{10}-4).

1) 12+3\frac{3}{8}-1\frac{5}{6} = 12 + 3\frac{9}{24} - 1\frac{20}{24} = 15\frac{9}{24} - 1\frac{20}{24} = 14\frac{33}{24} - 1\frac{20}{24} = 13\frac{13}{24}

2) 7\frac{8}{15} = \frac{113}{15}; 5\frac{7}{10}-4 = 1\frac{7}{10} = \frac{17}{10}

3) \frac{113}{15} \cdot \frac{17}{10} = \frac{1921}{150}

4) 13\frac{13}{24} + \frac{1921}{150} = 13 + \frac{13}{24} + \frac{1921}{150} = 13 + \frac{325}{600} + \frac{7684}{600} = 13 + \frac{8009}{600} = 13 + 13\frac{209}{600} = 26\frac{209}{600}

Ответ: 26\frac{209}{600}