Вычислите: 1. 19 * (-5) + 58; 2. -47 - 18 * (-4); 3. (7/8 - 5/24) * 3/14; 4. 5,3 - 5,1 : 0,3; 5. (6/5 - 3/4) * 2/3; 6. 1,54 + 0,5 * (-1,3); 7. 25/54 : (7/12 - 13/18) + 2 * 2 2/3.

1. $19 \cdot (-5) + 58 = -95 + 58 = -37$ 2. $-47 - 18 \cdot (-4) = -47 + 72 = 25$ 3. $(\frac{7}{8} - \frac{5}{24}) \cdot \frac{3}{14} = (\frac{21}{24} - \frac{5}{24}) \cdot \frac{3}{14} = \frac{16}{24} \cdot \frac{3}{14} = \frac{2}{3} \cdot \frac{3}{14} = \frac{2}{14} = \frac{1}{7}$ 4. $5,3 - 5,1 : 0,3 = 5,3 - 17 = -11,7$ 5. $(\frac{6}{5} - \frac{3}{4}) \cdot \frac{2}{3} = (\frac{24}{20} - \frac{15}{20}) \cdot \frac{2}{3} = \frac{9}{20} \cdot \frac{2}{3} = \frac{3 \cdot 1}{10 \cdot 1} = \frac{3}{10} = 0,3$ 6. $1,54 + 0,5 \cdot (-1,3) = 1,54 - 0,65 = 0,89$ 7. $\frac{25}{54} : (\frac{7}{12} - \frac{13}{18}) + 2 \cdot 2\frac{2}{3}$ 1) $\frac{7}{12} - \frac{13}{18} = \frac{21}{36} - \frac{26}{36} = -\frac{5}{36}$ 2) $\frac{25}{54} : (-\frac{5}{36}) = -\frac{25}{54} \cdot \frac{36}{5} = -\frac{5 \cdot 2}{3 \cdot 1} = -\frac{10}{3} = -3\frac{1}{3}$ 3) $2 \cdot 2\frac{2}{3} = 2 \cdot \frac{8}{3} = \frac{16}{3} = 5\frac{1}{3}$ 4) $-3\frac{1}{3} + 5\frac{1}{3} = 2$ **Ответ: 2**