Вопрос:

39. Вычислите:

Ответ:

Решение:



  1. A) \( 2,4 + (-5,36) - (-0,84) + (-3,24) = 2,4 - 5,36 + 0,84 - 3,24 = (2,4 + 0,84) - (5,36 + 3,24) = 3,24 - 8,6 = -5,36 \)

  2. Б) \( -16,54 + (-9,31) - 11,27 - (-23,38) = -16,54 - 9,31 - 11,27 + 23,38 = (-16,54 - 9,31 - 11,27) + 23,38 = -37,12 + 23,38 = -13,74 \)

  3. B) \( 5 \frac{5}{7} + \left(-2 \frac{1}{3}\right) - \left(-\frac{3}{15}\right) = 5 \frac{5}{7} - 2 \frac{1}{3} + \frac{3}{15} = \frac{40}{7} - \frac{7}{3} + \frac{1}{5} = \frac{200 - 147 + 21}{35} = \frac{74}{35} = 2 \frac{4}{35} \)

  4. Г) \( 3 \frac{5}{9} + \left(-2 \frac{1}{4}\right) - \left(-\frac{5}{6}\right) - \frac{2}{3} = 3 \frac{5}{9} - 2 \frac{1}{4} + \frac{5}{6} - \frac{2}{3} = \frac{32}{9} - \frac{9}{4} + \frac{5}{6} - \frac{2}{3} = \frac{128 - 81 + 30 - 24}{36} = \frac{53}{36} = 1 \frac{17}{36} \)

  5. Д) \( -3,27 + (-4,84) + 6,51 + (-2,64) + 7,65 = -3,27 - 4,84 + 6,51 - 2,64 + 7,65 = (-3,27 - 4,84 - 2,64) + (6,51 + 7,65) = -10,75 + 14,16 = 3,41 \)

  6. E) \( \frac{5}{6} + \left(-\frac{5}{9}\right) + \frac{1}{3} - \frac{11}{18} = \frac{5}{6} - \frac{5}{9} + \frac{1}{3} - \frac{11}{18} = \frac{15 - 10 + 6 - 11}{18} = \frac{-10}{18} = - \frac{5}{9} \)

  7. E) \( -4 \frac{5}{8} + \left(-\frac{6}{24}\right) - \left(-\frac{5}{16}\right) = -4 \frac{5}{8} - \frac{6}{24} + \frac{5}{16} = -4 \frac{5}{8} - \frac{1}{4} + \frac{5}{16} = - \frac{37}{8} - \frac{1}{4} + \frac{5}{16} = \frac{-148 - 4 + 5}{16} = \frac{-147}{16} = -9 \frac{3}{16} \)

  8. Ж) \( 3,1 + (-4,72) + (-8,12) - (-0,96) = 3,1 - 4,72 - 8,12 + 0,96 = (3,1 + 0,96) - (4,72 + 8,12) = 4,06 - 12,84 = -8,78 \)

  9. 3) \( -18,31 - 6,27 + (-8,44) - (-31,67) = -18,31 - 6,27 - 8,44 + 31,67 = (-18,31 - 6,27 - 8,44) + 31,67 = -33,02 + 31,67 = -1,35 \)

  10. И) \( 6 \frac{5}{12} - \left(-4 \frac{2}{3}\right) + \left(-\frac{3}{4}\right) = 6 \frac{5}{12} + 4 \frac{2}{3} - \frac{3}{4} = \frac{77}{12} + \frac{14}{3} - \frac{3}{4} = \frac{77 + 56 - 9}{12} = \frac{124}{12} = \frac{31}{3} = 10 \frac{1}{3} \)

  11. K) \( 2 \frac{5}{6} + \left(-\frac{3}{8}\right) - \left(-2 \frac{7}{12}\right) + 4 \frac{3}{4} - \left(-1 \frac{1}{3}\right) = 2 \frac{5}{6} - \frac{3}{8} + 2 \frac{7}{12} + 4 \frac{3}{4} + 1 \frac{1}{3} = \frac{17}{6} - \frac{3}{8} + \frac{31}{12} + \frac{19}{4} + \frac{4}{3} = \frac{136 - 9 + 62 + 114 + 16}{24} = \frac{319}{24} = 13 \frac{7}{24} \)


Ответ: Приведены решения для всех пунктов.

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