Question

4. Calculați respectând ordinea efectuării operațiilor în calcule.


ajutămă te rog:​

Answer 1

$(0.6 - \frac{14}{15} )\cdot \frac{6}{7} - ( \frac{8}{35} - 0.8) : ( - 2 \frac{2}{3} ) \\ \\ = ( \frac{3}{5} - \frac{14}{15} )\cdot \frac{6}{7} - ( \frac{8}{35} - \frac{4}{5} ) : ( - \frac{8}{3} ) \\ \\ = \frac{9 - 14}{15} \cdot \frac{6}{7} - \frac{8 - 28}{35} \cdot( - \frac{3}{8} ) \\ \\ = - \frac{5}{15} \cdot \frac{6}{7} - ( - \frac{28}{35} )\cdot( - \frac{3}{8} ) \\ \\ = - \frac{1}{3} \cdot \frac{6}{7} + \frac{4}{7} \cdot( - \frac{3}{8} ) \\ \\ = - \frac{2}{7} + \frac{1}{7} \cdot( - \frac{3}{2} ) \\ \\ = - \frac{2}{7} - \frac{3}{14} \\ \\ = \frac{ - 4 - 3}{14} \\ \\ = \frac{ - 7}{14} \\ \\ = - \frac{1}{2}$