Question

Calcule as expressões

Answer 1

$\frac{4}{15} * \frac{1}{6} = \frac{2}{15} * \frac{1}{3} = \frac{2}{45} \\ \\ \frac{12}{7} * \frac{1}{-10} = \frac{6}{7} * \frac{1}{-5} = -\frac{6}{35} \\ \\ \frac{ -\frac{4}{7}+ \frac{11}{5} }{ \frac{19}{14} } =( \frac{-20+77}{35} )* \frac{14}{19} = \frac{57}{35} * \frac{14}{19} = \frac{798}{665} \\ \\ \frac{ \frac{1}{6} + ( \frac{-2}{3}* \frac{5}{2}) }{1 + \frac{1}{2} } = \frac{ \frac{1}{6} - \frac{5}{3} }{ \frac{3}{2} } =( \frac{3-30}{18} )* \frac{2}{3} = \frac{-54}{54} = -1$