Question

 Eu não consigo resolver 3x10-²+5,4x10-¹

Answer 1

$3.10^{-2}+5,4.10^{-1}= \\ 3.10^{-2}+54.10^{02} \\ (3+54).10^{-2} \\ 57.10^{-2}= \\ \boxed{5,7.10^{-1}}$