Question

como faz a conta 2/5×(-1/4)²-1/8

Answer 1

$\frac{2}{5}.(-\frac{1}{4})^2-\frac{1}{8}=\\ \\ \frac{2}{5}.\frac{1}{16}-\frac{1}{8}=\\ \\ \frac{1}{40}-\frac{1}{8}=\frac{1-5}{40}=-\frac{4}{40}=-\frac{1}{10}$

Answer 2

$\frac{2}{5}. (-\frac{1}{4} )^2- \frac{1}{8} \\ \\ \frac{2}{5}. \frac{1}{16} - \frac{1}{8} \\ \\ \frac{2}{80}- \frac{1}{8} \\ \\ \frac{1}{40}- \frac{1}{8} ~\to~ \frac{1-5}{40} ~\to~- \frac{4}{40} ~\to~- \frac{1}{10}$