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Sagot :

Bonjour,

[tex] \frac{7}{11} + \frac{2}{11} = \frac{9}{11} [/tex]

[tex] \frac{13}{9} - \frac{5}{9} = \frac{8}{9} [/tex]

[tex] \frac{7}{13} - \frac{9}{13} = - \frac{2}{13} [/tex]

[tex] - \frac{5}{7} - \frac{4}{7} = - \frac{9}{7} [/tex]

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