Bonjour a tous vous pouvez m aider a demontrer que ces quatre fomule est exacte pour tous les nombre entier 2^3-2 =1x2x3 8-2=6 1x2x3=6

3^3-3= 2x3x4 27-3=24 2x3x4=24

4^3-4 =3x4x5 64-4=60 3x4x5=60

5^3-5 = 4x5x6 125-5 =120 4x5x6=120

formule

1)n^3-n= (n-1)(n)(n+1)

2)n^3-n=n(n²-1)

3)n²-1)(n-1)(n+1)

4)n^3-n=(n-1)(n)(n+1)
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