Предмет: Математика, автор: dtv291972

cредняя масса четырех мальчиков-37.5кг,а трех из них-39кг. узнать массу четвертого мальчика.

Ответы

Автор ответа: grishamariya

(39+39+39+х)4=37.5
(117+х)4=37.5
117+х=37.5*4
117+х=150
х=150-117
х=33 кг

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