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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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