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Sagot :

bjr

C = 5/7 - (2/7) /(-3)

                                  [  (2/7) / (-3) = - 2/(7 x 3)  ]

C = 5/7 + 2/(7 x 3) = (5 x 3)/(7 x 3) + 2/(7 x 3)

                            = 15/21 + 2/21

                            = 17/21

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