simplifier :

[tex] \frac{15}{45} + \frac{18}{27} [/tex]
[tex] \frac{8}{6} + \frac{9}{4} [/tex]
[tex] \frac{7}{18} + \frac{6}{9} [/tex]
[tex] \frac{72}{12} + \frac{24}{8} [/tex]

aidez moi svp ...

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