Предмет: Математика, автор: aek2012

Помогите решить задачу: Боря купил 4 книги. ВСе книги без первой стоят 42 р. Без второй- 40 р. Без 3 -38 р. Без 4 - 36. Сколько стоит каждая книга?

Ответы

Автор ответа: love67
0

2кн+3кн+4кн = 42руб
1 кн+3кн+4кн = 40 руб
1кн+2кн+4кн = 38 руб
1кн+2кн+3кн= 36руб

 (42+40+38+36):3=156:3=52 руб стоит набор из 4 х книг
52-42=10 руб стоит 1 книга
52-40=12 руб стоит 2 книга
52-38=14 руб стоит 3 книга
52-36=16 руб стоит 4 книга
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