Bonjour ;
[tex]A = \dfrac{5}{2} + \dfrac{3}{4} - \dfrac{7}{8} = \dfrac{20}{8} + \dfrac{6}{8} - \dfrac{7}{8} = \dfrac{19}{8} .[/tex]
[tex]B = \dfrac{4}{15} + \dfrac{2}{5}- \dfrac{7}{30} = \dfrac{8}{15} + \dfrac{12}{30} - \dfrac{7}{30} = \dfrac{13}{30} .[/tex]
