1. Найдите значение выражения: 1. (-15,6+9, 2) × 1; 2.(3-1):(-1).

Решение:

1. \((-15.6 + 9.2) \times 1\frac{1}{3}\)
1. \(-15.6 + 9.2 = -6.4\)
2. \(1\frac{1}{3} = \frac{4}{3}\)
3. \(-6.4 \times \frac{4}{3} = -\frac{64}{10} \times \frac{4}{3} = -\frac{32}{5} \times \frac{4}{3} = -\frac{128}{15} = -8\frac{8}{15}\)
2. \((3\frac{1}{5}) : (-1\frac{1}{5})\)
1. \(3\frac{1}{5} = \frac{16}{5}\)
2. \(1\frac{1}{5} = \frac{6}{5}\)
3. \(\frac{16}{5} : (-\frac{6}{5}) = \frac{16}{5} \times (-\frac{5}{6}) = -\frac{16}{6} = -\frac{8}{3} = -2\frac{2}{3}\)

Ответ: -8⅘; -2⅓.