1. Вычислить. 1) -1 \(\frac{1}{5}\) \(\cdot\) (-15) 2) -1,95 - 8,68 3) -7 - (-4) + 3 4) -2,16 : \(\frac{3}{50}\) 5) 1 \(\frac{3}{8}\) - 3 \(\frac{5}{6}\)

Решение:

1. \(-1 \frac{1}{5} \cdot (-15) = -\frac{6}{5} \cdot (-15) = \frac{6 \cdot 15}{5} = 6 \cdot 3 = 18\)
2. \(-1,95 - 8,68 = -10,63\)
3. \(-7 - (-4) + 3 = -7 + 4 + 3 = 0\)
4. \(-2,16 : \frac{3}{50} = -2,16 \cdot \frac{50}{3} = -0,72 \cdot 50 = -36\)
5. \(1 \frac{3}{8} - 3 \frac{5}{6} = \frac{11}{8} - \frac{23}{6} = \frac{33}{24} - \frac{92}{24} = \frac{33 - 92}{24} = -\frac{59}{24} = -2 \frac{11}{24}\)

Ответ: 1) 18; 2) -10,63; 3) 0; 4) -36; 5) -2 \(\frac{11}{24}\).