Предмет: Алгебра, автор: vika040

Номер 20! Пожалуйста помогите !
Заранее спасибо ;)

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Автор ответа: Опыт

0

1/(V1+V2)=5
1/(V1-V2)=7
2V2=1/5-1/7=2/35
V2=1/35
(V1-V2)/V2=(1/7)/(1/35)=5
ОТВЕТ В 5 РАЗ

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