a. Comparer 3√5 et 2√7
b. déduire la comparaison de: 7-3√5 et 7-2√7
c. Soient x et y des nombres réels tels que : 5≤x≤7 : -4≤ y ≤-3 a- Encadrer : x+y; 3y - 2x b
Montrer que, 3≤ (y + 7)
[tex] \sqrt{x + y} [/tex]
≤8​
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