Salut svp aidez moi a résoudre cet exercice et mrc bcp d'

soit a un réel tel que : 0 < a < 1 .
on pose : b= √a +1 /2
1- montrer que : 1 /2 < b < 1
2- montrer que : b - a= (1-√a) (1+2√a) /2
3- on déduire que : a

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