Question

Diketahui log 2 = 0,3010, log 3 = 0,4771; dan log 7 = 0,8451 tentuka :
a. log 18 | b. log 21 | c. log 10,5 | d. log 1/7

Answer 1

A. log 18 = log (2x3pangkat2)
= log2 + log 3(pangakat 2)
=0,3010 + (0,4771 x 2) = 1,2552

B. log21 = log (3x7)
= log 3 + log 7 
= 0,4771 + 0,8451 = 1,3222

C. log 10,5 = log 
= log 21 - log 2
= 1,3222 - 0,3010 = 1,0212

D. log 1/7 maap saya lupa