срочноооооооооо пжпжпжпжпжпжпжпж даю 10 баллов​

а) [tex]( \frac{2}{5} - \frac{1}{4} ) + \frac{9}{20} = \frac{3}{20} + \frac{9}{20} = \frac{3}{5}[/tex]

б) [tex]\frac{7}{30} + (\frac{3}{5} - \frac{1}{6} ) = \frac{7}{30} + \frac{13}{30} = \frac{2}{3}[/tex]

в) [tex]\frac{7}{8} - ( \frac{1}{9} + \frac{2}{3}) = \frac{7}{8}-\frac{7}{9} = \frac{7}{72}[/tex]

г) [tex](\frac{5}{14} + \frac{9}{10} ) - \frac{5}{7} = \frac{44}{35} - \frac{5}{7} = \frac{19}{35}[/tex]

[tex]1)( \frac{2}{5} - \frac{1}{4} ) + \frac{9}{20} = \frac{8 - 5 + 9}{20} = \frac{12}{20} = \frac{3}{5} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \: \: \: 2) \frac{7}{30} + ( \frac{3}{5} - \frac{1}{6} ) = \frac{7 + 18 - 5}{30} = \frac{20}{30} = \frac{2}{3} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ 3) \frac{7}{8} - ( \frac{1}{9} + \frac{2}{3} ) = \frac{63 - 8 - 48}{72} = \frac{7}{72} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \\ 4)( \frac{5}{14} + \frac{9}{10} ) - \frac{5}{7} = \frac{25 + 63 - 50}{70} = \frac{38}{70} = \frac{19}{35} \: \: \: \: \: [/tex]