Question: Voil comment dmontrer que si d > c, on a d(d - c) > 1/2(d^2-c^2): c c+d < d+d > 1/2 (c+d) d(d-c)>1/2 (d-c)(d+c) =
Voil comment dmontrer que si d > c, on a d(d - c) > 1/2(d^2-c^2):
c
De la mme manire, dmontrer que si d > c 0, on a 3d^2(d - c) > d^3- c^3
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