Вычислите: а) 3 1/5 + (-1 13/18) - 2 3/8; б) (-7 5/18 + 2 4/9 + 32) : 4/9; գ) -5 + 5 2/5 : 1/10; դ) 12 5/14 * 2/9 - 5 3/8 * 2/9; ե) 4 5/7 * 2 10/11 : (-2 5/8 * 4 5/7); զ) (-3 2/5 * 4 1/8) : 1 1/7

ա) $3 \frac{1}{5} + (-1 \frac{13}{18}) - 2 \frac{3}{8} = 3,2 - 1 \frac{13}{18} - 2,375 = \frac{16}{5} - \frac{31}{18} - \frac{19}{8} = \frac{576 - 310 - 427,5}{180} = -\frac{653}{720} \approx -0,907$ բ) $(-7 \frac{5}{18} + 2 \frac{4}{9} + 32) : \frac{4}{9} = (-7 \frac{5}{18} + 2 \frac{8}{18} + 32) : \frac{4}{9} = (-4 \frac{15}{18} + 32) : \frac{4}{9} = (32 - 4 \frac{5}{6}) : \frac{4}{9} = 27 \frac{1}{6} : \frac{4}{9} = \frac{163}{6} \cdot \frac{9}{4} = \frac{163 \cdot 3}{2 \cdot 4} = \frac{489}{8} = 61 \frac{1}{8}$ գ) $-5 + 5 \frac{2}{5} : \frac{1}{10} = -5 + \frac{27}{5} \cdot 10 = -5 + 27 \cdot 2 = -5 + 54 = 49$ դ) $12 \frac{5}{14} \cdot \frac{2}{9} - 5 \frac{3}{8} \cdot \frac{2}{9} = \frac{2}{9} \cdot (12 \frac{5}{14} - 5 \frac{3}{8}) = \frac{2}{9} \cdot (12 \frac{20}{56} - 5 \frac{21}{56}) = \frac{2}{9} \cdot 6 \frac{55}{56} = \frac{2}{9} \cdot \frac{391}{56} = \frac{391}{9 \cdot 28} = \frac{391}{252} = 1 \frac{139}{252}$ ե) $4 \frac{5}{7} \cdot 2 \frac{10}{11} : (-2 \frac{5}{8} \cdot 4 \frac{5}{7}) = (4 \frac{5}{7} : 4 \frac{5}{7}) \cdot (2 \frac{10}{11} : -2 \frac{5}{8}) = 1 \cdot (\frac{32}{11} : -\frac{21}{8}) = -\frac{32 \cdot 8}{11 \cdot 21} = -\frac{256}{231} = -1 \frac{25}{231}$ զ) (-3 \frac{2}{5} \cdot 4 \frac{1}{8}) : 1 \frac{1}{7} = (- \frac{17}{5} \cdot \frac{33}{8}) : \frac{8}{7} = - \frac{561}{40} \cdot \frac{7}{8} = - \frac{3927}{320} = -12 \frac{87}{320}