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jawab

5.
²log 8 - ³log 27 + ⁵log 25 - ⁶log 1 =
= ²log 2³ - ³log 3³ + ⁵log 5² - ⁶log 6⁰
= 3 - 3 + 2 - 0
= 2

6. log 54 = log  27 + log 2
= log 3³ + log 2
= 3 log 3 + log 2
= 3 b  + a

7. 
-x + 3y = 14...|kali 2
2x - 4y = -16.

-2x + 6y  = 28
2x + 4y = - 16
..........................(+)
2y = 12
y = 6

-x + 3y = 14
-x + 3(6) = 14
-x + 18 = 14
-x = - 4
x = 4

x  :  y  = 4  :  6 
x  :  y  = 2  :  3