Предмет: Математика, автор: Maykhap4ik

Помогите решить задачу 6 клас . 1456

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Автор ответа: miki68

х - на первой полке
2х - на второй
вместе 30
х+2х=30
3х=30
х=10 книг на первой стало
10+2=12 книг было на первой
30-12=18 книг было на второй

Автор ответа: Maykhap4ik

Спасибо большое. Очень помогло.

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