Вычисли выражения, начиная с номера 31

31. $\frac{12}{25} \cdot \frac{5}{16} = \frac{3}{20}$ 32. $1\frac{3}{4} \cdot 1\frac{3}{7} = \frac{7}{4} \cdot \frac{10}{7} = \frac{5}{2} = 2\frac{1}{2}$ 33. $2\frac{2}{3} \cdot 3\frac{3}{4} = \frac{8}{3} \cdot \frac{15}{4} = 10$ 34. $15\frac{7}{8} \cdot 1 = 15\frac{7}{8}$ 35. $0 \cdot 12\frac{3}{5} = 0$ 36. $2\frac{1}{2} \cdot 4\frac{2}{15} = \frac{5}{2} \cdot \frac{62}{15} = \frac{31}{3} = 10\frac{1}{3}$ 37. $(\frac{5}{12} + \frac{3}{8}) \cdot \frac{6}{19} = (\frac{10}{24} + \frac{9}{24}) \cdot \frac{6}{19} = \frac{19}{24} \cdot \frac{6}{19} = \frac{1}{4}$ 38. $(3\frac{1}{2} - 2\frac{3}{4}) \cdot (1\frac{1}{6} - \frac{1}{12}) = (\frac{7}{2} - \frac{11}{4}) \cdot (\frac{7}{6} - \frac{1}{12}) = (\frac{14}{4} - \frac{11}{4}) \cdot (\frac{14}{12} - \frac{1}{12}) = \frac{3}{4} \cdot \frac{13}{12} = \frac{13}{16}$ 39. $2\frac{2}{3} \cdot \frac{9}{16} - \frac{7}{24} \cdot 2 = \frac{8}{3} \cdot \frac{9}{16} - \frac{7}{24} \cdot 2 = \frac{3}{2} - \frac{7}{12} = \frac{18}{12} - \frac{7}{12} = \frac{11}{12}$ 40. $6\frac{6}{7} \cdot (\frac{11}{18} - \frac{5}{12}) = \frac{48}{7} \cdot (\frac{22}{36} - \frac{15}{36}) = \frac{48}{7} \cdot \frac{7}{36} = \frac{4}{3} = 1\frac{1}{3}$ 41. $8\frac{3}{5} - 3 \frac{15}{27} = 8\frac{3}{5} - 3 \frac{5}{9} = \frac{43}{5} - \frac{32}{9} = \frac{387}{45} - \frac{160}{45} = \frac{227}{45} = 5\frac{2}{45}$ 42. $\frac{3}{12} : \frac{3}{4} = \frac{1}{4} : \frac{3}{4} = \frac{1}{4} \cdot \frac{4}{3} = \frac{1}{3}$ 43. $\frac{4}{5} : \frac{8}{25} = \frac{4}{5} \cdot \frac{25}{8} = \frac{5}{2} = 2\frac{1}{2}$ 44. $8 : \frac{2}{7} = \frac{8}{1} \cdot \frac{7}{2} = 28$ 45. $1 : \frac{3}{17} = \frac{1}{1} \cdot \frac{17}{3} = \frac{17}{3} = 5\frac{2}{3}$ 46. $0 : 5\frac{1}{19} = 0$ 47. $0 - 5,6 = -5,6$ 48. $(5\frac{1}{19} - \frac{1}{19}) \cdot 6 = 5 \cdot 6 = 30$ 49. $3\frac{7}{12} : 1 = 3\frac{7}{12}$ 50. $10\frac{1}{3} : 2\frac{1}{3} = \frac{31}{3} : \frac{7}{3} = \frac{31}{3} \cdot \frac{3}{7} = \frac{31}{7} = 4\frac{3}{7}$ 51. $2\frac{2}{3} : 1\frac{1}{31} = \frac{8}{3} : \frac{32}{31} = \frac{8}{3} \cdot \frac{31}{32} = \frac{31}{12} = 2\frac{7}{12}$ 52. $\frac{2}{3} : \frac{6}{7} : \frac{4}{7} = \frac{2}{3} \cdot \frac{7}{6} \cdot \frac{7}{4} = \frac{49}{36} = 1\frac{13}{36}$ 53. $\frac{11}{12} : \frac{7}{12} : \frac{21}{55} = \frac{11}{12} \cdot \frac{12}{7} \cdot \frac{55}{21} = \frac{11}{7} \cdot \frac{55}{21} = \frac{605}{147} = 4\frac{17}{147}$ 54. $\frac{3}{8} : \frac{1}{9} \cdot \frac{5}{16} = \frac{3}{8} \cdot \frac{9}{1} \cdot \frac{5}{16} = \frac{135}{128} = 1\frac{7}{128}$ 55. $\frac{15}{16} : \frac{3}{8} : \frac{2}{5} = \frac{15}{16} \cdot \frac{8}{3} \cdot \frac{5}{2} = \frac{25}{4} = 6\frac{1}{4}$ 56. $\frac{13}{14} : \frac{7}{26} : \frac{3}{8} = \frac{13}{14} \cdot \frac{26}{7} \cdot \frac{8}{3} = \frac{13}{7} \cdot \frac{13}{7} \cdot \frac{8}{3} = \frac{1352}{147} = 9\frac{29}{147}$ 57. $(3\frac{1}{6} - 2\frac{7}{15}) : 1\frac{2}{5} = (\frac{19}{6} - \frac{37}{15}) : \frac{7}{5} = (\frac{95}{30} - \frac{74}{30}) : \frac{7}{5} = \frac{21}{30} : \frac{7}{5} = \frac{7}{10} \cdot \frac{5}{7} = \frac{1}{2}$ 58. $(2\frac{2}{3} + 1\frac{5}{6}) : 1\frac{1}{2} = (\frac{8}{3} + \frac{11}{6}) : \frac{3}{2} = (\frac{16}{6} + \frac{11}{6}) : \frac{3}{2} = \frac{27}{6} : \frac{3}{2} = \frac{9}{2} \cdot \frac{2}{3} = 3$ 59. $-2\frac{1}{2} - 1\frac{2}{3} = -\frac{5}{2} - \frac{5}{3} = -\frac{15}{6} - \frac{10}{6} = -\frac{25}{6} = -4\frac{1}{6}$ 60. $-7\frac{5}{12} - (-1\frac{5}{6}) = -\frac{89}{12} + \frac{11}{6} = - \frac{89}{12} + \frac{22}{12} = -\frac{67}{12} = -5\frac{7}{12}$ 61. $3\frac{1}{4} - (-5) = \frac{13}{4} + 5 = \frac{13}{4} + \frac{20}{4} = \frac{33}{4} = 8\frac{1}{4}$ 62. $\frac{7}{15} - \frac{12}{17}{30} = \frac{14}{30} - \frac{12}{17}{30} = \frac{2}{30} = \frac{1}{15}$ 63. $-\frac{3}{8} \cdot (-\frac{1}{9}) = \frac{3}{8} \cdot \frac{1}{9} = \frac{1}{8} \cdot \frac{1}{3} = \frac{1}{24}$ 64. $-\frac{2}{7} : (-\frac{8}{21}) = \frac{2}{7} \cdot \frac{21}{8} = \frac{1}{1} \cdot \frac{3}{4} = \frac{3}{4}$