Salut!
[tex] \frac{12}{15} = \frac{10}{15} + \frac{2}{15} [/tex]
[tex] \frac{10}{18} = \frac{5}{18} + \frac{5}{18} [/tex]
[tex] \frac{4}{11} = \frac{1}{11} + \frac{3}{11} [/tex]
[tex] \frac{9}{12} = \frac{5}{12} + \frac{4}{12} [/tex]
[tex] \frac{5}{10} = \frac{2}{10} + \frac{3}{10} [/tex]
[tex] \frac{7}{14} = \frac{4}{14} + \frac{3}{14} [/tex]
[tex] \frac{12}{9} = \frac{5}{9} + \frac{4}{9} [/tex]
[tex] \frac{18}{35} = \frac{9}{35} + \frac{9}{35} [/tex]
[tex] \frac{10}{12} = \frac{4}{12} + \frac{6}{12} [/tex]
[tex] \frac{16}{18} = \frac{10}{18} + \frac{6}{18} [/tex]
[tex] \frac{15}{20} = \frac{8}{20} + \frac{7}{20} [/tex]
[tex] \frac{28}{14} = \frac{7}{14} + \frac{21}{14} [/tex]
