Bonjour,
[tex]a = \frac{3-\frac{2}{3} }{\frac{4}{3} *7} \\\\a = \frac{\frac{9}{3} -\frac{2}{7} }{\frac{28}{3}}\\\\a = \frac{\frac{7}{3} }{\frac{28}{3}}\\\\a = \frac{7}{3} * \frac{3}{28} \\\\a = \frac{21}{84}\\\\a = \frac{7}{28}\\\\a = \frac{1}{4}[/tex]
[tex]b = \frac{\frac{2}{3} }{\frac{5}{6} } -\frac{2}{5} \\\\b = \frac{2}{3} * \frac{6}{5} } -\frac{2}{5}\\\\b = \frac{12}{15} - \frac{2}{5}\\\\b = \frac{12}{15} - \frac{6}{15}\\\\b = \frac{6}{15} \\\\b = \frac{2}{5}[/tex]
[tex]c = \frac{-\frac{3}{4}+\frac{1}{2}}{\frac{2}{5}-\frac{5}{2}}\\\\c = \frac{-\frac{3}{4}+\frac{2}{4}}{\frac{4}{10}-\frac{25}{10}}\\\\c = \frac{-\frac{1}{4}}{-\frac{21}{10}}\\\\c = \frac{1}{4} * \frac{10}{21} \\\\c = \frac{10}{84} \\\\c = \frac{5}{42} \\[/tex]
J'espère t'avoir aidé.
Si tu as des questions, n'hésites pas à me les demander.
Bonne journée et bonne continuation.
