Réponses

Meilleure réponse !
2014-09-10T19:30:34+02:00
X - 1 ≠ 0 
x ≠ 1 

valeur interdite : 1

A(x) = 2+ \frac{3}{x-1}\\\\
A(x) =  \frac{2(x-1)}{x-1}  + \frac{3}{x-1}\\\\
A(x) =  \frac{2x+1}{x-1}

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x + 3 ≠ 0 
x ≠ - 3

valeur interdite : -3

B(x) = 4- \frac{1}{x+3}\\\\
B(x) =  \frac{4(x+3)}{x+3}  - \frac{1}{x+3}\\\\
B(x) = \frac{4x+11}{x+3}

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2x + 1 ≠ 0
2x ≠ -1
x ≠ -1/2

valeur interdite : -1/2

C(x) = 3- \frac{2}{2x+1}\\\\
C(x) =  \frac{3(2x+1)}{2x+1}  - \frac{2}{2x+1}\\\\
C(x) =  \frac{6x+1}{2x+1}