Question

Diketahui log 2=0,3010 log 3=0,4771 dan log 7 = 0,8451 tentukan log 18 , log 21, log 10,25 dan log 1 per 7

Answer 1

1. log 18 = log (2.3.3)
= log 2 + log 3 + log 3
= 0,3010 + 0,4771 + 0,4771
= ... (hasilnya hitung sendiri)
2. log 21 = log (7.3)
= log 7 + log 3
= 0,8451 + 0,4771
= ... (hasilnya hitung sendiri)
3. log 1/7 = log (1 : 7)
= log 1 - log 7
= 0 - 0,8451
= -0,8451