Предмет: Математика, автор: Аноним

У Ани было 10 рублей. После того, как она купила 2 книги, у нее осталось 5 рублей. Сколько денег заплатила Аня за одну книгу? Решите задачу с помощью уравнения и модели часть- целое.

Ответы

Автор ответа: demonsrun

Пусть x - одна книга. Сост. ур
10 - 2x = 5
2x = 10-5
2x = 5
x = 5 : 2
x = 2,5 руб.

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