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Автор - kitkatishka

Помогите пожалуйста решить
1) 2log1/5 10 - log1/5 28 + 3/2log1/5 ∛49
2)Зная что log2 a=14 найти: log2 (8a)
желательно с подробностями

Ответ

Автор - terikovramazan

Ответ:

Объяснение:

2log1/5 10 - log1/5 28 + 3/2log1/5 ∛49=log1/5 10² - log1/5 28 + log1/5 (7²)^(1/3)^(3/2)=log1/5 100 - log1/5 28 + log1/5 7=log1/5 100×7/28=log1/5 25=-2

log2 (8a)=log2 8+log2 a=3+14=17

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