Найдите 45% от 80 , найдите число 5/9 которого равно 40 , сколько % составляет 8 от 40?

Найдите 45% от 80 , найдите число 5/9 которого равно 40 , сколько % составляет 8 от 40?
- Предмет:
  Математика
- Автор:
  dennisbowen
- 6 лет назад

Ответы 1

▪45% от 80 это: $\frac{45}{100} \times 80 = \frac{9 \times 80}{20} = 9 \times 4 = 36$ ▪Найти х, если: $\frac{5}{9} x= 40 \\ x = 40 \div \frac{5}{9} = \frac{40 \times 9}{5} = 8 \times 9 = 72$ ▪составим пропорцию:40 = 100% 8 = ?%Решим пропорцию:8 × 100 ÷ 40 = 800 ÷ 40 = 80/4 = 20%Ответ: 8 составляет 20% от 40.
- Автор:
  manuela8jar
- 6 лет назад
- 0
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Найдите 45% от 80 , найдите число 5/9 которого равно 40 , сколько % составляет 8 от 40?

Ответы 1

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