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a guest Jan 17th, 2019 62 Never
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  1. from math import*
  2. borne_inf=float(input("Borne inférieure de l'intervalla d'étude:"))
  3. image_borne_inf=2*borne_inf-2
  4. borne_sup=float(input("Borne supérieure de l'intervalle d'étude:"))
  5. image_borne_sup=4*borne_sup-4
  6. ecart=abs(borne_sup-borne_inf)
  7. if image_borne_inf<0 and image_borne_sup<0:
  8.     print("Les images sont de meme signe:impossible d'executer l'algorithme.")
  9. else:
  10.   if image_borne_inf>0 and image_borne_sup>0
  11.       print("Les images sont de meme signe:impossible d'exécuter l'algorythme.")
  12.   else:
  13.      while (ecart>0.01):
  14.         milieu=(borne_inf+borne_sup)/2
  15.         image_milieu=2*milieu-2
  16.         if image_milieu<0 and image_borne_inf>0:
  17.             borne_sup=milieu
  18.         else:
  19.           if image_milieu>0 and image_borne_sup<0:
  20.               borne_inf=milieu
  21.         ecart=abs(borne_sup-borne_inf)
  22.         print("l'antécédent de 0 par f vaut",milieu,"au centième près.")
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