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6
AFFICHAGE D'UN NOMBRE DECIMAL
La calculatrice utilise le POINT DECIMAL et
non la virgule.
Ce point est caractéristique de l'écriture américaine (et
anglaise) des nombres décimaux.
Dans le premier tableau, nous voulons écrire le nombre
décimal 34,58. Nous frappons 34.58 .
affichage touche affichage touche
0. AC 0. AC
3. 3 0.
34. 4 0.6 6
34. 0.63 3
34.5 5
34.58 8
Si le nombre à afficher est inférieur à 1, (par exemple
0,63), on peut ne pas afficher le zéro qui précède le
point décimal. (Exemple du second tableau).
Remarque:
- Pressez AC puis affichez 1.234567891. Le point
décimal n'occupe pas la place d'un chiffre. Vous pouvez
donc afficher des décimaux qui s'écrivent avec 10
chiffres.
- Pressez AC puis affichez 0.123456789. Vous constatez
que ZERO occupe la place d'un chiffre. C'est normal
puisque ZERO est un chiffre.
ADDITION DE DEUX
NOMBRES
Essayons de découvrir comment la calculatrice
s'organise pour effectuer une addition. Prenons par
exemple 3+2=5. Une calculatrice n'est d'ailleurs pas
nécessaire pour connaître le résultat! Mais nous nous
intéressons seulement au fonctionnement de la machine.
9


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