Предмет: Математика, автор: a80153079

Помогите пожалуста мне очень срочно
Знайдіть число,28% якого дорівнюють значення виразу (3 7/12-2 11/18+2 1/24)× 1 5/31

Ответы

Автор ответа: dyexfnf
2

Ответ: 0,98

Пошаговое объяснение:

28% от (3 7/12 - 2 11/18 + 2 1/24) * 1 5/31

1) 3 7/12 + 2 1/24 = 3 14/24 + 2 1/24 = 5 15/24 = 5 5/8

2) 5 5/8 - 2 11/18 = 5 45/72 - 2 44/72 = 3 1/72

3) 3 1/72 * 1 5/31 = 217/72 * 36/31 = 7/2 = 3,5

4) Складемо пропорцію:

100%  - 3,5

28%   - х

х = 3,5 * 28% : 100%  = 0,98

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