Réponse :
Bonjour,
A = [tex]\frac{7}{24} :\frac{21}{2} = \frac{7}{24} *\frac{2}{21}=\frac{14}{504} =\frac{1}{36}[/tex]
B = [tex]\frac{\frac{5}{7} }{\frac{8}{9} } = \frac{5}{7} *\frac{9}{8} =\frac{45}{56}[/tex]
C = [tex]\frac{-2}{\frac{10}{3}} = -2 *\frac{3}{10} = \frac{-20}{10}*\frac{3}{10} = \frac{-2}{1} *\frac{3}{10} = \frac{-6}{10} =\frac{-3}{5}[/tex]
D = [tex]\frac{2}{3} *(5 - \frac{1}{4} )= \frac{2}{3} *5 - \frac{2}{3} *\frac{1}{4} = \frac{10}{3} -\frac{1}{6} = \frac{20}{6} -\frac{1}{6} =\frac{19}{6}[/tex]
Voilà bonne journée !
