Question

please help everyone gives unusual answers no-one helps me ​

Answer 1

(a) =

$(a) = \frac{2 }{5} + \frac{7}{3} - \frac{4}{5} - \frac{1}{3} \\ \\ = \frac{ - 2}{5} + \frac{6}{3} \: \: \: \: \: \: \: \: \\ \\ = \frac{ - 2}{5} + \frac{10 }{5} \: \: \: \: \: \\ \\ = \frac{ - 8}{5} \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

$(b) = \frac{3}{7} - \frac{11}{7} - \frac{4}{9} + \frac{7}{9} \\ \\ = \frac{ - 8}{7} + \frac{3}{9} \: \: \: \: \: \: \: \: \: \\ \\ = \frac{ - 8}{7} + \frac{1}{3} \: \: \: \: \: \: \: \: \: \\ \\ = \frac{ - 17}{21} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$