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Sagot :

Réponse :

1) E = x²-1-(x²-4)

 E= x²-1-x²+4 = 3

E =(x+1)(x-1)-((x+2)(x-2)

x= 125:

[(125+1)(125-1)]-[(125+2)(125-2)] = (x+1)(x-1)-((x+2)(x-2) = 3

126*124-127*123=3

Explications étape par étape

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