diketahui log 2= 0,3010; log 3=0,4771 dan log 7= 0,8451 tentukan a. log 18 b. log 21 c .log 10,5 d. log 1/7
Matematika
yacubrahman23
Pertanyaan
diketahui log 2= 0,3010; log 3=0,4771 dan log 7= 0,8451 tentukan a. log 18 b. log 21 c .log 10,5 d. log 1/7
1 Jawaban
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1. Jawaban mhaidarfh02
a. Log 18 = log 2.3.3
= log 2 + log 3 + log 3
= 0,301 + 0,4771 + 0, 4771
= 1,2552
b. Log 21 = log 3.7
= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
c. Log 10,5 = log 21/2
= log 21 - log 2
= 1,3222 - 0,301
= 1,0212
d. Log 1/7 = - log 7
= - 0,8451