Question

O produto (log2 7) (log7 5) (log5 4) é igual a
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5

Answer 1

$(\log_27)(\log_75)(\log_54)$

$\frac{\log7}{\log2}.\frac{\log5}{\log7}.\frac{\log4}{\log5}$

$\frac{\log7.\log5.\log4}{\log2.\log7.\log5}$

$\frac{\log4}{\log2}$

$\log_24$

$2$

Gabarito: B)