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Meilleure réponse !
2014-06-02T22:01:52+02:00



8

  a) A = B
         2x + 3 = 5 - 4x
       2x + 4x = 5 - 3
               6x = 2
                 x = 1/3

  b) B = C
        5 - 4x = -1/3 + x
       -4x - x = - 1/3 - 5
            -5x = - 16 /3
               x = 16/15  ou x = 1 1/15

  c) A = C
      2x + 3 = -1/3 + x
       2x - x = -1/3 - 3
              x =  - 10 /3  ou  x = - 3 1/3

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