9.Найти значение выражений

Привет! Давай решим примеры по порядку. а) $(-15.64 : 4?rac{3}{5} + 7.1) \cdot 2?rac{2}{5} = (-15.64 : 4.6 + 7.1) \cdot 2.4 = (-3.4 + 7.1) \cdot 2.4 = 3.7 \cdot 2.4 = 8.88$ б) $(0.4 - \frac{11}{15}) \cdot 1?rac{2}{7} - (\frac{7}{18} - 0.5) : 1?rac{1}{6} = (\frac{6}{15} - \frac{11}{15}) \cdot \frac{9}{7} - (\frac{7}{18} - \frac{9}{18}) : \frac{7}{6} = (-\frac{5}{15} \cdot \frac{9}{7}) - (-\frac{2}{18} : \frac{7}{6}) = (-\frac{1}{3} \cdot \frac{9}{7}) - (-\frac{1}{9} \cdot \frac{6}{7}) = -\frac{3}{7} - (-\frac{2}{21}) = -\frac{9}{21} + \frac{2}{21} = -\frac{7}{21} = -\frac{1}{3}$ в) $0.8 : ((\frac{2}{3})^2 + \frac{5}{9}) = 0.8 : (\frac{4}{9} + \frac{5}{9}) = 0.8 : 1 = 0.8$ г) $\frac{37.12 - 5.6 : 0.14}{1.21 + 3.4 \cdot 0.35} = \frac{37.12 - 40}{1.21 + 1.19} = \frac{-2.88}{2.4} = -1.2$ д) $(2.17 \cdot 3.7 - 1.83 \cdot 2.3) : 19.1 = (8.029 - 4.209) : 19.1 = 3.82 : 19.1 = 0.2$ е) $5\frac{4}{19} \cdot 3\frac{4}{7} + 1\frac{15}{19} : \frac{7}{25} - 1\frac{2}{3} = (\frac{99}{19} + \frac{34}{19}) \cdot \frac{25}{7} - \frac{5}{3} = (\frac{133}{19}) \cdot \frac{25}{7} - \frac{5}{3} = 7 \cdot \frac{25}{7} - \frac{5}{3} = 25 - \frac{5}{3} = 25 - 1\frac{2}{3} = 23\frac{1}{3}$