Question

O valor da expressão log 2 + log 3 - log 4 é ?

Answer 1

Resposta:

log a +log b =log a*b

log a - log b = log (a/b)

log a + log b - log c = log (a*b/c)

log 2 + log 3 - log 4 = log (2*3/4)  = log (3/2) = log 3 - log 2

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ou faça

log a^b = b* log a

log 2 + log 3 - log 4

=log 2 + log 3 - log 2²

=log 2 + log 3 -2 log 2 = log 3- log 2  = log (3/2)