Salut
[tex]\frac{-2}{3} *\frac{4}{5}[/tex]
[tex]-\frac{2}{3} *\frac{4}{5}[/tex]
[tex]-\frac{8}{15}[/tex]
-------------------------------
[tex]-\frac{2}{3} *(-\frac{4}{5})[/tex]
[tex]\frac{8}{15}[/tex]
--------------------------------
[tex]\frac{2}{7} *(-\frac{3}{5})[/tex]
[tex]-\frac{6}{35}[/tex]
---------------------------------
[tex]-9*\frac{3}{5}[/tex]
[tex]-\frac{1}{9} *\frac{3}{5}[/tex]
[tex]-\frac{9*3}{1*5}[/tex]
[tex]-\frac{27}{5}[/tex]
