Предмет: Математика, автор: Миленочка0510

Когда прочитали 35 страниц, осталось прочитать 2/7 книги. Сколько страниц в книге? ( с пояснениями позязя))

Ответы

Автор ответа: Freakazoid

35

если после 35 страниц осталось 2/7, то выходит было прочитано 5/7.

7/7 - 2/7 = 5/7.

решаем с помощью пропорции: 5/7 = 35

2/7 = x

5/7х = 35 * 2/7

х = 10 : 5/7

х = 14 страниц осталось.

всего страниц: 35 + 14 = 49

Автор ответа: ФАИНА1984

87

1)1-2/7=5/7 книги-прочитал.

2)35:5*7=49стр-в книге.

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