Tính giá trị của biểu thức

a) \[\frac{7}{9} + \frac{2}{3}:\frac{2}{5} = \frac{7}{9} + \frac{5}{3}\]

               = \[\frac{7}{9} + \frac{{15}}{9}\]                           

               = \[\frac{{22}}{9}\]

b) \[\frac{1}{4} \times (\frac{3}{5} + 1)\]

= \[\frac{1}{4} \times \frac{8}{5}\]

= \[\frac{8}{{20}} = \frac{2}{5}\]

c) \[\frac{5}{{12}} - \frac{1}{3}:\frac{4}{3} = \frac{5}{{12}} - \frac{1}{4}\]

                = \[\frac{5}{{12}} - \frac{3}{{12}}\]              

                 =\[\frac{2}{{12}} = \frac{1}{6}\]                                              

d) \[\frac{6}{{11}} \times \frac{3}{{12}} - \frac{5}{{44}} = \frac{3}{{22}} - \frac{5}{{44}}\]

                     =\[\frac{6}{{44}} - \frac{5}{{44}}\]

                     = \[\frac{1}{{44}}\]