Предмет: Математика, автор: l1sswell

срочно нужно, пожалуйста

Приложения:

Ответы

Автор ответа: yuliannaitkids

1

Ответ:

13 на нижній, 39 на верхній

Пошаговое объяснение:

на нижній полиці х кних, тоді на другій - 3х.

х+11=3х-15

х-3х=-11-15

-2х=-26

х=13

3х=39

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