Bonjour, Déterminer le signe de 5√2-8 ? SUR 17 pts!!!! Comment fait on ?.... Pergunta de ideia deSamy7awa

May 2019 1 34 Report

Bonjour,
Déterminer le signe de 5√2-8 ?
SUR 17 pts!!!! Comment fait on ?

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Bonsoir,
On sait que:
$\sqrt{2} < 1.5$
Donc
$5 \times \sqrt{2} < 5 \times 1.5 \\ 5 \sqrt{2} < 7.5$
Or
$7.5 < 8$
Donc
$5 \sqrt{2} < 7.5 < 8$
Donc
$5 \sqrt{2} - 8 < 0$
Donc cette opération donne une résultat négatif.

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