Réponses

2014-10-29T15:52:03+01:00
(25-2x)³
= 25³ - 2 x 25 x 2x + 2x³
= 15625 - 31250x + 8
= 15633 - 31250x.
2014-10-29T15:56:10+01:00
Salut;

(25-2x)³=(25-2x)² (25-2x)
           =(625-100x+4x²)(25-2x)
            =-8x³+200x²-1250x+100x²-2500x+15625
           =-8x³+300x²-3750x+15625

Cordialement.