Thực hiện các phép tính sau (rút gọn kết quả nếu c...

Câu hỏi: Thực hiện các phép tính sau (rút gọn kết quả nếu có thể):$\begin{array}{l}a)\;\frac{5}{9} + \frac{2}{9} &  &  & b)\;\frac{3}{5} + \frac{3}{7} &  &  & c)\;\frac{7}{{15}} - \frac{2}{5}\\d)\;6 - \frac{5}{7} &  &  & e)\;\frac{2}{3} - \frac{1}{{12}} + \frac{3}{4} &  &  & f)\;\frac{{11}}{3} - 2 - \frac{1}{5}\end{array}$

A $a)\frac{7}{9}$                          $b)\frac{{36}}{{35}}$                          $c)\frac{1}{{15}}$                              $d)\frac{{37}}{7}$                  $e)\frac{4}{3}$                          $f)\frac{{22}}{{15}}$

B $a)\frac{8}{9}$                          $b)\frac{{36}}{{35}}$                          $c)\frac{1}{{14}}$                              $d)\frac{{37}}{7}$                  $e)\frac{4}{3}$                          $f)\frac{{22}}{{14}}$

C $a)\frac{7}{9}$                          $b)\frac{{34}}{{35}}$                          $c)\frac{1}{{15}}$                              $d)\frac{{38}}{7}$                  $e)\frac{4}{3}$                          $f)\frac{{23}}{{15}}$

D $a)\frac{2}{9}$                          $b)\frac{{36}}{{35}}$                          $c)\frac{1}{{13}}$                              $d)\frac{{37}}{7}$                  $e)\frac{4}{7}$                          $f)\frac{{22}}{{15}}$