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Sagot :

27)

a)

[tex] \frac{21}{10} [/tex]

b)

[tex] \frac{3}{20} [/tex]

c)

[tex] \frac{7}{5} [/tex]

28)

a)

[tex] \frac{2}{11} [/tex]

b)

[tex] \frac{10}{7} [/tex]

c)

[tex] \frac{14}{5} [/tex]

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