1. Вычислить: 1) -1\(\frac{4}{5}\)\(\cdot\)(-15); 2) -1,5 - 8,68; 3) -7 - (-4) + 3; 4) -1\(\frac{4}{5}\) : \(\frac{3}{50}\); 5) 1\(\frac{1}{8}\) - 3\(\frac{5}{6}\).

Решение:

1. 1) \(-1\frac{4}{5}\cdot(-15) = -\frac{9}{5}\cdot(-15) = \frac{9\cdot15}{5} = 9\cdot3 = 27\)
2. 2) \(-1,5 - 8,68 = -10,18\)
3. 3) \(-7 - (-4) + 3 = -7 + 4 + 3 = 0\)
4. 4) \(-1\frac{4}{5} : \frac{3}{50} = -\frac{9}{5} : \frac{3}{50} = -\frac{9}{5} \cdot \frac{50}{3} = -\frac{9\cdot50}{5\cdot3} = -3\cdot10 = -30\)
5. 5) \(1\frac{1}{8} - 3\frac{5}{6} = \frac{9}{8} - \frac{23}{6} = \frac{9\cdot3 - 23\cdot4}{24} = \frac{27 - 92}{24} = -\frac{65}{24} = -2\frac{17}{24}\)

Ответ: 1) 27; 2) -10,18; 3) 0; 4) -30; 5) -2\(\frac{17}{24}\).