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

1) $$-1\frac{4}{5} \cdot (-15) = -\frac{9}{5} \cdot (-15) = \frac{9 \cdot 15}{5} = 9 \cdot 3 = 27$$ 2) $$-1,95 - 8,68 = -10,63$$ 3) $$-7 - (-4) + 3 = -7 + 4 + 3 = -7 + 7 = 0$$ 4) $$-2,16 : \frac{3}{50} = -2,16 \cdot \frac{50}{3} = -\frac{216}{100} \cdot \frac{50}{3} = -\frac{216 \cdot 50}{100 \cdot 3} = -\frac{216}{2 \cdot 3} = -\frac{216}{6} = -36$$ 5) $$1\frac{1}{8} - 3\frac{5}{6} = \frac{9}{8} - \frac{23}{6} = \frac{9 \cdot 3}{8 \cdot 3} - \frac{23 \cdot 4}{6 \cdot 4} = \frac{27}{24} - \frac{92}{24} = \frac{27 - 92}{24} = \frac{-65}{24} = -2\frac{17}{24}$$