Предмет: Математика, автор: vproxorovv

за 2книги заплатили 272 р цена 1 книги составляет третью часть цены другой книги сколько стоит каждая книга

Ответы

Автор ответа: svetoplazma2010
0
272:4=68 - стоимость более дешевой книги
272-68=204 - стоимость более дорогой книги
Автор ответа: mari1925
0
Пусть 1 книга стоит х руб., тогда 2 книга  - х/3 . за них эаплатили 272 руб.  
Уравнение
х+х/3=272
(3х+х)/3=272
4х=272*3
4х=816
х=816:4
х=204  (руб) - стоит 1 книга
204:3= 68 (руб) -стоит 2 книга

Проверка:
204+68=272 руб.

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