Предмет: Математика, автор: lazkoov

помогите с 7-8 пожалуйста честно не понимаю

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Автор ответа: ludmilaksenija2005

1

Пошаговое объяснение:

7.

пропорция:

42 грн - 1 часть

х грн - 6/7 части

х=6/7•42:1=36 грн стоит учебник

8.

пропорция:

20учен - 4/5 ч

х учен - 1 ч

х=20•1:4/5= 20•5/4=25 учеников всего

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