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Sagot :

Bonjour,

Calculer:

a= 2- √3

a²= (2- √3)²= (2- √3)(2- √3)= 4-2√3-2√3+√9= 4-4√3+3= 7-4√3

a³= (2- √3)³= (2- √3)(2- √3)(2- √3)= (2- √3)(7-4√3)= 14-7√3-8√3+4√9

   = 14-15√3+4x3= 26-15√3

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