Question

cum se face primul exercitiu?

Answer 1

$\displaystyle \left(- \frac{3}{4} - \frac{1}{8} : \frac{3}{4} \right): \left(+ \frac{13}{8} \right)=\left(- \frac{3}{4} - \frac{1}{8} \cdot \frac{4}{3} \right) : \frac{13}{8} =\left(- \frac{3}{4} - \frac{4}{24} \right) \cdot \frac{8}{13} = \\ \\ =\left(- \frac{18}{24} - \frac{4}{24} \right) \cdot \frac{8}{13} =- \frac{22}{24} \cdot \frac{8}{13} =- \frac{176}{312}=- \frac{22}{39}$