Question

Seja Logx 7 = 20 e logx 5 = 5 . Calculando logx ( 7 / 5 ) , o resultado é :


A ) 1

B ) 2

C ) 3

D ) 4

E ) 5


Me ajudem por favor !!​

Answer 1

$\Large\boxed{\begin{array}{l}\rm Seja~\ell og_x7=20~e~\ell og_x5=15.\\\rm Calculando~\ell og_x\bigg(\dfrac{7}{5}\bigg)~o~resultado~\acute e:\\\tt a)\sf 1\\\tt b)~\sf2\\\tt c)~\sf3\\\tt d)~\sf4\\\tt e)~\sf5\\\sf\ell og_x\bigg(\dfrac{7}{5}\bigg)=\ell og_x7-\ell og_x5\\\sf\ell og_x\bigg(\dfrac{7}{5}\bigg)=20-15=5\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~E}}}} \end{array}}$