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Pour le second exemple, nous rappelons que le signe
parenthèse implicitement l'expression placée sous la
barre. Il faudra donc faire:
( 11 + 38 ) 7.
Remarque: on peut utiliser un raccourci en exécutant
11 + 38 = 7.
Il faut presser la touche AC, pour reprendre "la main".
REMARQUE: la touche a été pressée après
l'écriture du nombre ou après le calcul de l'expression,
alors que dans l'écriture mathématique le symbole
est placé au début.
ATTENTION, DANGER !
la racine carrée d'un nombre négatif est un non-sens
mathématique. Toute tentative de ce genre provoquera
l'affichage d'un message d'erreur - E - , comme le montre
l'exemple suivant:
5 +/- - E -
5 2.236067977
Attention: ne pas confondre -7
2
qui donne -49, comme
nous venons de le voir, avec (-7)
2
qui donne 49 et qui doit
s'exécuter:
7
+/- X
2
49
RACINE CARREE D'UN NOMBRE
Exemples: 5 et 11 + 38
39


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