Question

Adotando log3= 0,477, log4= 0,602 e log5= 0,699, calcule:
A)log 81
B)log 0,9
C)log 16
D)log 15

Answer 1

Log 81 =
81 = 3 x 3 x 3 x 3
Log 81 = Log 3 + Log 3 + Log 3 + Log 3
Log 81 = 0,477 + 0,477 + 0,477 + 0,477
Log 81= 1,908