minta jawaban no 4.a sama 4.d aja (caranya juga)

log 2 = 0.3010
log 3 = 0.4771
log 7 = 0.8541

log 18 = log(3² x 2) = log 3² + log 2 = 2. log 3 + log 2 = 2(0.4771) + 0.3010 = ....

log [tex] \frac{1}{7} [/tex] = log 1 - log 7 = 0 - 0.8541 = -0.8541