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Sagot :

f(1) = 3×1 - 4 = 3 - 4 = - 1

Vérification  f(1+h)=3h-1 :

f (1 + h ) =  3(1+h) - 4 =  3×1 + 3×h - 4 = 3 + 3h - 4 = 3h - 1

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