Jika 7log 5 =a dan 5log 4 =b, maka ⁴log 35=

Kelas 10 Matematika
Bab Logaritma

⁴log 35
= (⁵log 35) / (⁵log 4)
= (⁵log (5 . 7)) / b
= (⁵log 5 + ⁵log 7) / b
= (1 + 1/a) / b
= (a + 1)/a : b
= (a + 1)/ab