Контрольные задания > 86. Вычислите: 1)-6 ⋅ 42 ⋅ (-5); 2)-0,4 ⋅ 19 ⋅ 25; 3) 1,25 ⋅ (-8) ⋅ (-0,5) ⋅ (-2); 4) 4,78 ⋅ (-4) ⋅ 25 ⋅ (-0,001);
Вопрос:

86. Вычислите: 1)-6 ⋅ 42 ⋅ (-5); 2)-0,4 ⋅ 19 ⋅ 25; 3) 1,25 ⋅ (-8) ⋅ (-0,5) ⋅ (-2); 4) 4,78 ⋅ (-4) ⋅ 25 ⋅ (-0,001);

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Ответ:

Ответ: 1) 1260; 2) -190; 3) -10; 4) 0,478

Краткое пояснение: Используем переместительное и сочетательное свойства умножения.

Решение:

  1. -6 ⋅ 42 ⋅ (-5) = -6 ⋅ (-5) ⋅ 42 = 30 ⋅ 42 = 1260

  2. -0,4 ⋅ 19 ⋅ 25 = -0,4 ⋅ 25 ⋅ 19 = -10 ⋅ 19 = -190

  3. 1,25 ⋅ (-8) ⋅ (-0,5) ⋅ (-2) = 1,25 ⋅ (-8) ⋅ (-0,5) ⋅ (-2) = -10 ⋅ 1 = -10

  4. 4,78 ⋅ (-4) ⋅ 25 ⋅ (-0,001) = 4,78 ⋅ (-4) ⋅ 25 ⋅ (-0,001) = -4,78 ⋅ 0,1 = -0,478

Ответ: 1) 1260; 2) -190; 3) -10; 4) 0,478

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