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`@Fun` 

`a) log_a x = log_a(a^3b^2sqrtc)` 

`log_a x = log_a a^3 + log_a b^2 + log_a c^(1/2)` 

`log_a x = 3log_a a + 2log_a b + 1/2 log_a c` 

`log_a x = 3 + 2 log_a b + 1/2 log_a c` 

`log_a x = 3 + 2.3  -2. 1/2` 

`log_a x = 3 + 6 - 1` 

`log_a x = 9 - 1` 

`log_a x =` 

$b) log_a x = log_a \dfrac{a^4 . \sqrt[3]{b}}{c^3}$

`log_a x = log_a ( (a^4 . b^(1/3))/(c^3))` 

`log_a x = log_a a^4 + log_a b^(1/3) - log_a c^3` 

`log_a x = 4 log_a a + 1/3 log_a b - 3log_a c`

`log_a x = 4 + 1/3log_a b - 3log_a c` 

`log_a x = 4 + 1/3 . 3 - (-2).3` 

`log_a x = 4 + 1 +6`

`log_a x = 5 + 6`

`log_a x = 11` 

Câu `7:` 

`log_3 x = 4 log_3 a + 7 log_3 b` 

`log_3 x =log_3 a^4 + log_3 b^7` 

`log_3 x = log_3 (a^4 .b^7)` 

Vậy `x = a^4 b^7` 

`log_5 x = 2log_5 a - 3log_5 b` 

`log_5 x = log_5 a^2 - log_5 b^3` 

`log_5 x = log_5 ((a^2)/(b^3))`

Vậy `x = (a^2)/(b^3)`