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Sagot :

Réponse:

a)

[tex] \frac{2}{7} + \frac{10}{21} = \frac{2 \times 3}{7 \times 3} + \frac{10}{21}= \frac{6 + 10}{21} = \frac{16}{21} [/tex]

b)

21 - 16 / 21 = 5/21

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