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= log 3 + log 7
= 0,4771 + 0,8451
= 1,3222
b. log 10,5 = log (7x3)
2
= log 7 + log 3 - log 2
= 0,8451 + 0,4771 - 0,3010
= 1,0212
c. log 1 = log 1 - log 7 = 0 - 0,8451 = -0,8451
7