Diketahui log 2 = 0,3010; log 3 = 0,4771; dan log 7 = 0,8451 tentukan: a. log 18 b. log 21

Question

Matematika Diposting : 2017-09-10 Diupdate : 2017-09-28 RirisAnggriani

Pertanyaan

Diketahui log 2 = 0,3010; log 3 = 0,4771; dan log 7 = 0,8451 tentukan:
a. log 18
b. log 21

Answer 1

a) log18 = log (3²*2)
=log 3² + log 2
=2*log3 + log 2 =2(0,4771) + (0,3010)
=1.2552

b) log21 = log (7 * 3)
= log 7 + log 3 = 0,8451 + 0,4771
=1.3222