2/3-4/5 diviser par -8/15

[tex] \frac{\frac{2}{3} - \frac{4}{5} }{-\frac{8}{15} } } = (\frac{2}{3} - \frac{4}{5}) * -\frac{15}{8} = (\frac{10}{15} - \frac{12}{15}) * -\frac{15}{8} = -\frac{2}{15}* -\frac{15}{8} = \frac{30}{120} =\frac{3}{12} = \frac{1}{4}[/tex]