Контрольные задания > The problem includes several mathematical expressions and text that appears to be a label for a task. The mathematical expressions are: B = 1, C = 4, and a fraction 10/14. There is also a fraction 17/9. The text label is "9 задание". Finally, there is an equation: x - 5(x + 3) = 5.
Вопрос:

The problem includes several mathematical expressions and text that appears to be a label for a task. The mathematical expressions are: B = 1, C = 4, and a fraction 10/14. There is also a fraction 17/9. The text label is "9 задание". Finally, there is an equation: x - 5(x + 3) = 5.

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Ответ:

Решение:

  • Задание 9
  • Уравнение:\[ x - 5(x + 3) = 5 \]
  • Раскроем скобки:\[ x - 5x - 15 = 5 \]
  • Приведем подобные слагаемые:\[ -4x - 15 = 5 \]
  • Перенесем константу в правую часть:\[ -4x = 5 + 15 \]
  • \[ -4x = 20 \]
  • Найдем x:\[ x = \frac{20}{-4} \]
  • \[ x = -5 \]

Ответ: x = -5

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