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kartew
@kartew
August 2022
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Решите уравнение) Логарифмы.
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oganesbagoyan
Verified answer
Task/26675159
--------------------
1 +2Log (x+2) 5 = Log₅ (x+2) ; ОДЗ :{ x+2 >0 ; x+2 ≠ 1
1 +2 / Log₅ (x+2) = Log₅ (x+2) ; замена Log₅ (x+2) =t
t² - t -2 =0 ;
t₁= -1⇒ Log₅ (x+2) = - 1 ⇔ x+2 = 5⁻¹ ⇔ x = - 1,8 ;
t₂ = 2 ⇒ Log₅ (x+2) =2 ⇔ x+2 = 5² ⇔ x = 23 .
Ответ: - 1, 8 ; 23.
2 votes
Thanks 1
kartew
Спасибо, вы мне помогли)
kartew
это решено способом замены основания?
kartew
..логорифма?
oganesbagoyan
Log(a) b = 1 / Log(b) заменa: Log₅ (x+2) заменили на t
kartew
спасибо
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Answers & Comments
Verified answer
Task/26675159--------------------
1 +2Log (x+2) 5 = Log₅ (x+2) ; ОДЗ :{ x+2 >0 ; x+2 ≠ 1
1 +2 / Log₅ (x+2) = Log₅ (x+2) ; замена Log₅ (x+2) =t
t² - t -2 =0 ;
t₁= -1⇒ Log₅ (x+2) = - 1 ⇔ x+2 = 5⁻¹ ⇔ x = - 1,8 ;
t₂ = 2 ⇒ Log₅ (x+2) =2 ⇔ x+2 = 5² ⇔ x = 23 .
Ответ: - 1, 8 ; 23.