Réponse :
Bonjour,
1. (-2(3+x)-(1-2x)*1 ) / (3+x)²= -6-2x-1+2x / (3+x)² = -7 / (3+x)²
2. -2 + 7/(3+x) = -2(3+x) /(3+x) + 7/(3+x) = -6-2x / (3+x) + 7/(3+x) = (1-2x)/(3+x)= f(x)
3. 0*(3+x) - 7*1 / (3+x)²
4. f'(-2) = -7/ (3-2)² = -7
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Réponse :
Bonjour,
1. (-2(3+x)-(1-2x)*1 ) / (3+x)²= -6-2x-1+2x / (3+x)² = -7 / (3+x)²
2. -2 + 7/(3+x) = -2(3+x) /(3+x) + 7/(3+x) = -6-2x / (3+x) + 7/(3+x) = (1-2x)/(3+x)= f(x)
3. 0*(3+x) - 7*1 / (3+x)²
4. f'(-2) = -7/ (3-2)² = -7