Предмет: Математика, автор: amir260611

На первый книжной полке 1/4 всех книг
На второй 2/5 всех книг
На третей 28 книг Сколько книг на трёх полках

Ответы

Автор ответа: Anonim17389
0

Ответ:

1/4+2/5=13/20 составляют две полки.

Тогда третья 7/20; 28/7=4 это 1/20 часть

13*4=52 книги на 2 полках

28+52=80 книг всего

Автор ответа: tipix5050
0
вот так
если не понятен почерк извиняюсь
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