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Sagot :

Bonjour,

1/3 +2/7

même dénominateur:

7/21 + 6/21 = 13/21

-[-4/(7-3)]

-[-4/(4)] = -(-1) = +1

(4/5)/(6/7)

on multiplie par l'inverse

4/5 * 7/6 = 28/30 = 14/15

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