Réponse :
Bonjour,
Exo 75 :
[tex]A= \frac{-3}{10} * \frac{-2}{7} = \frac{6}{70} =\frac{3}{35}[/tex]
[tex]B= \frac{3}{4} *\frac{12}{7} =\frac{36}{28} =\frac{9}{7}[/tex]
[tex]C=3*\frac{-2}{-9} =\frac{3}{1} *\frac{-2}{-9} = \frac{-6}{-9} =\frac{2}{3}[/tex]
Exo 76:
[tex]A=\frac{-8}{9} /\frac{7}{4} =\frac{-8}{9} *\frac{4}{7} = \frac{-32}{63}[/tex]
[tex]B=\frac{11}{3} / \frac{-5}{4} =\frac{11}{3} *\frac{4}{-5} =\frac{44}{-15} \\\\[/tex]
[tex]C= \frac{-2}{3}/\frac{-10}{7} =\frac{-2}{3} *\frac{7}{-10} =\frac{-14}{-30}=\frac{7}{15}[/tex]
