1. Вычислить. 1) -1⁴/₅ \(\cdot\) (-15) 4) -2,16 : 3/₅₀ 2) -1.95-8.68 5) 11/₈ - 3⁵/₈ 3) -7 - (-4) + 3

1. Вычисления:

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. \( -7 - (-4) + 3 = -7 + 4 + 3 = 0 \)
4. \( -2,16 : \frac{3}{50} = -2,16 \cdot \frac{50}{3} = -0,72 \cdot 50 = -36 \)
5. \( 1\frac{1}{8} - 3\frac{5}{8} = \frac{9}{8} - \frac{29}{8} = \frac{9 - 29}{8} = \frac{-20}{8} = -2\frac{4}{8} = -2\frac{1}{2} \)

Ответ: 1) 27; 2) -10.63; 3) 0; 4) -36; 5) -2.5.