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Sagot :

Réponse :

Explications étape par étape :

f(x) = x^4/-8 + 1 / x^5

f(x) = -1/8 . x^4 + x^-5

f'(x) = -1/8 .4x^3 -5 . x^-6

f'(x)= -1/2 x^3 -5 / x^6

f'(x) = -x^6 / 2x^6 - 10 / 2x^6

f'(x) = (-x^6 - 10) / 2x^6

f'(x) =-(x^6+10)/2x^6

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