jika a Log b = m dan b Log c = n maka ab Log bc adalah...

a log b = m ---> blog a = 1/m
ab log bc = b log bc / b log ab
= b log b + blog c / blog a + blog b
= 1 + n / (1/m + 1)
= n + 1 / (m+1/m)
= m(n +1) / m + 1