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Dewar
@Dewar
February 2021
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Bonjour ! J'ai un dm de maths demain et deux questions auxquelles je
Galère, Les voici :
Soit f la fonction définie sur ]0;+infini[ par f(x) = x + 1/x.
1) Calculer f(x)=-2. En déduire que f admet pour minimum 2.
2) a,b,ç,d,e,f,g,h, sont huit réels strictement positifs, démontrer l'inégalité suivante en utilisant la première question :
a/h + b/g + c/f + d/e + e/d + f/c + g/b + h/a >= 8 (plus grand ou égal que 8)
Merci !
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