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Sagot :

Réponse :

3.1 274 = 100 + 3m

3.2 174 = 3m

    m = 174 / 3

    m = 58

4.1 615 = 30*(x-7) + 3x

     615 = 30x - 210 + 3x

      615 - 210 = 33x

     405 = 33x

      405 / 33 = x

      x = 12.273

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