Question

Ao resolver a expressão 1

Answer 1

$\displaystyle \frac{1}{2}.\frac{2}{5}+[\ (\frac{1}{3}+\frac{1}{2})\ .\frac{12}{10}\ ]\\\\\\ \frac{1.2}{2.5}+[\ (\frac{2}{6}+\frac{3}{6}).\frac{6}{5}\ ]\\\\\\ \frac{2}{10}+[\ \frac{5}{6}.\frac{6}{5}\ ]\\\\\\ \frac{2}{10}+\frac{1}{1}\\\\\\ \frac{2}{10}\\\\\\ \bf \frac{1}{5}$
 
Portanto, letra D.