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

Решение:

1. \(-1\frac{1}{4} \cdot (-15) = -\frac{5}{4} \cdot (-15) = \frac{75}{4} = 18\frac{3}{4}\)
2. \(-1,95 - 8,68 = -10,63\)
3. \(-7 - (-4) + 3 = -7 + 4 + 3 = 0\)
4. \(-2,16 \frac{3}{50} = -2,16 \cdot \frac{3}{50} = -2,16 \cdot 0,06 = -0,1296\)
5. \(1\frac{1}{8} - 3\frac{3}{6} = \frac{9}{8} - \frac{21}{6} = \frac{9 \cdot 3 - 21 \cdot 4}{24} = \frac{27 - 84}{24} = \frac{-57}{24} = -\frac{19}{8} = -2\frac{3}{8}\)

Ответ: 1) \(18\frac{3}{4}\); 2) -10,63; 3) 0; 4) -0,1296; 5) \(-2\frac{3}{8}\).