Question

calcula (3 - 7/4) * ( 1/3 + 7/15)/2*(2/5-2/7)

Answer 1

$\frac{(3- \frac{7}{4}).( \frac{1}{3}+ \frac{7}{15}) }{2.( \frac{2}{5} - \frac{2}{7} } \\ \\ = \frac{ (\frac{12-7}{4}). (\frac{5+7}{15}) }{2.( \frac{14-10}{35}) } \\ \\ = \frac{( \frac{5}{4}). (\frac{12}{15}) }{2.( \frac{4}{35}) } \\ \\ = \frac{ \frac{60}{60} }{ \frac{8}{35} } \\ \\ =1. \frac{35}{8} \\ \\ = \frac{35}{8} \\ \\ =4 \frac{3}{8}$