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PRIORITE DANS
LES CALCULS
Nous avons vu, dans les chapitres précédents, que dans
une suite de calculs où n'interviennent que des signes +
ou que des signes x, la touche = n'était pas nécessaire
pour les résultats intermédiaires.
Regardons maintenant ce qui se passe dans une suite
de calculs où interviennent simultanément des signes +
et x.
PRIORITE A LA MULTIPLICATION
Suivez avec votre calculatrice les exemples de calculs
proposés dans les tableaux 1 et 2 de la page suivante.
Les calculs effectués peuvent s'écrire ainsi:
tableau 1: 3 x 7 + 5 =
tableau 2: 5 + 7 x 3 =
C'est le même travail qui est exécuté dans des sens
différents. Le même résultat est obtenu (heureusement!).
Cependant, en observant les affichages successifs, on
constate une différence dans les deux exécutions.
Dans le tableau 1, la multiplication a d'abord été
effectuée.
aff. touche
X
0. AC
3. 3
3. x
7. 7
21. +
5. 5
26. =
aff. touche
X
0. AC
5. 5
5. +
7. 7
7. x
3. 3
26. =
tableau 1 tableau 2
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