Question

Calcula log25 (base 10) sendo log2=0,3 e log3=0,5

Answer 1

Temos que:

$log ~25 = log ~( \frac{100}{4} ) = log ~100 - log ~4 = log ~100 - log ~2^2 \\ \\ log ~25 = log~100 - 2*log ~2 \\ \\ log ~25 = 2 - 2*(0,3) \\ \\ log ~25 = 2 - 0,6 \\ \\ log ~25 = 1,4$