soit-2(a (-1et-1b (2) pose E = y₁²+ya-b²+2b-3 1) D'onner un encadrement de E 2/a/ vérifier que: E = (20+1)^²-(b-1) = 3 b) En déduire un autre encadreme de E C/ comparer les amplitudes des deux c/ encadrements précédents​
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