jika 2 log 5 = a maka 5 log 7 = b maka 35 log 100 adalah

²log5 = a
5log7 = b

35log100 = 5log100/5log35
= 5log(5² x 2²) / 5log(5x7)
= (2. 5log5 + 2.5log2) ÷ (5log5 + 5log7)
= (2 + 2/a) ÷ (1 + b)
= (2a +2)/(a + ab)