Question

se a = (1+ 2/3) e b e tal que ab =1, entao o valor de b é: a)5/2 b)3/5 c)5/3 d)2/5 e)2/3.

Answer 1

$a = 1 + \frac{2}{3} \\ a = \frac{3+2}{3}\ (foi\ feito\ o\ mmc) \\ a = \frac{5}{3} \\ \\ ab = 1 \\ \frac{5}{3} .\ b = 1 \\ b = \frac{1}{ \frac{5}{3} } \\ b = 1 . \frac{3}{5} \\ b = \frac{3}{5} \\ \\ Resposta\ letra\ B$