Diketahui log 2 = 0,3010 ;log 3 = 0,4771 dan log 7 = 0,8451. Tentukan :
a. log 10,5
b. log 1/7
a. log 10,5
b. log 1/7
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= log (21/2)
= log 21 - log 2
= log (3×7) - log 2
= log 3 + log 7 - log 2
= 0,4771 + 0,8451 - 0,3010
= 1,0212.
log 1/7
= log 7⁻¹
= - log 7
= - 0,8541