Предмет: Математика, автор: elzach

Было 9 листов бумаги.Некоторые из них разрезали на три части. Всего стало 15 листов. Сколько листов бумаги разрезали?

Ответы

Автор ответа: DominikUser3

пусть х листов разрезали

3х+9=15

3x=6

x=3

для второклассника метод подбора

пусть разрезали 1 лист,тогда 8+3 равно 11

до 15 не хватает 4 листов.это еще 2 разрезаных,значит разрезали 3 листа

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