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Exercice 32
   Le point d’équilibre est donné par la résolution de l’équation

                                       300 2400
                               100 −       = 2
                                        p2   p
                                       3        2400
                           100 1 −          =
                                       p2        p2
                                        3    10 · 240
                             10   1−       =
                                        p2      p2
                                        3   240
                                  1−     2
                                           = 2
                                        p    p
Exercice 32 (suite..)
                                   3
                      p2      1−      = 240 on élève au carré
                                   p2
                               3
                     p4 1 −        = 2402
                              p2
                               3p4
                          p4 − 2 = 2402
                                p
                  p 4 − 3p2 − 2402 = 0


   On pose p2 = x, il vient

             x 2 − 3x − 2402 = 0 Cette équation a 2 solutions :
             x ∼ 241, 50 et x = −238, 50
                =

   Comme p2 = x = 241, 50, on trouve

                           p=+        241, 50 ∼ 15, 54
                                              =
Exercice 32 (suite..)
   Le prix du marché est donc de 15,54 pour une quantité échangée de
   q = 15,542 ∼ 9, 93.
        2400
              =

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Ch06 32

  • 1. Exercice 32 Le point d’équilibre est donné par la résolution de l’équation 300 2400 100 − = 2 p2 p 3 2400 100 1 − = p2 p2 3 10 · 240 10 1− = p2 p2 3 240 1− 2 = 2 p p
  • 2. Exercice 32 (suite..) 3 p2 1− = 240 on élève au carré p2 3 p4 1 − = 2402 p2 3p4 p4 − 2 = 2402 p p 4 − 3p2 − 2402 = 0 On pose p2 = x, il vient x 2 − 3x − 2402 = 0 Cette équation a 2 solutions : x ∼ 241, 50 et x = −238, 50 = Comme p2 = x = 241, 50, on trouve p=+ 241, 50 ∼ 15, 54 =
  • 3. Exercice 32 (suite..) Le prix du marché est donc de 15,54 pour une quantité échangée de q = 15,542 ∼ 9, 93. 2400 =