jika 2 log 3 = x dan 3 log 5 = y maka 75 log 18 =

x +y = 2 log 5 / 2 log 3 + 2 log 3
x+y = 2 log 15 - 2 log 3
x + y = 2 log 15 -x
2x + y = 2 log 15
1/15 log 2 = 2x+y
15 log 2 × 2x +y = 1
15 log 2 = 1/ 2x+y

75 log 18
75 log 3 3 2
75 log 3^2 +75 log 2
2/ 3 log 75 + 1/ 2 log 75
2/3 log 3 ×5 ×3 + 1/2 log 3 5 3
2/ 2× 3 log 5 + 1/ 2 log 3^2 + 2 log 5
5log 3 + 1/2 × 2 log 15
5 log 3 + 15 log 2 /2

1 /y + 1/2x+y/2
setelah itu disamakan penyebut nya

semoga dapat membantu