Предмет: Алгебра, автор: maks0067

помогите мне срочно пожалуйста

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Автор ответа: tracv9175

1

Ответ:

Одна тетрадь стоила 3 крюка.

Объяснение: 12 тетрадей и 8 ручек вместе стоят 52 крюка.

7 тетрадей на 13 крюков дороже 4 ручек.

Пускай одна тетрадь стоит х крюков, тогда 7 тетрадей будет стоить 7х крюков. Одна ручка будет стоить (7х-13)/4 - крюков.

Складываем равенство: 12x+8(7x-13)/4 =52;

12x+2×(7x-13)=52;

12x+14x-26=52;

26x=52+26;

26x=78;

x=78/26=3.

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