Question

considerando log2 =0,3 e log5= 0,7 determine log2/5

Answer 1

$\log _{ }\left(\frac{2}{5}\right)\\\log _{ }\left(2\right)-\log \:_{\:}\left(5\right)\\0,3-0,7\\-0,4$

$\boxed {\boxed{Resposta:\:\bold{log\:\left(\frac{2}{5}\right)=-0,4}}}$