Question

-12-1sétimo resposta matematica

Answer 1

$- 12 - \frac{1}{7} = - \frac{ 12}{1} - \frac{1}{7} = - \frac{ 84}{7} - \frac{1}{7} = \\ \\ = - 1( \frac{84 + 1}{7} ) = - 1( \frac{85}{7} ) = - \frac{85}{7}$