5Log 3 = a , 3Log 4 = b, Nilai dari 12 Log 75= .. Mohon bantuan terimakasih:)

12 log 75
= log 75 / log 12
= log 15.5 / log 4.3
= log 15+log 5 / log 4+log 3
isi bilangan pokoknya
= 5log 15 + 5log 5 / 3log 4 + 3log 3
= 5log 15 + 1 / b+1
= 5log 5.3 + 1 / b+1
= 5log 5 + 5log 3 + 1 / b+1
= 1+a+1 / b+1
= 2+a / b+1