Предмет: Математика, автор: medyzij

3.Скільки сторінок у книзі, якщо 3/7 частини цієї книги становить 21 сторінку?

Ответы

Автор ответа: angelochekcheek

Ответ:

49 ст.

Пошаговое объяснение:

3/7=3+3+1=7

3=21

3/7•2=21•2=42

1=21:3

1=7

3(21)+3(21)+1(7)=49

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