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278 Hiérarchie de l'EOS™ (Equation Operating System)
Hiérarchie de l'EOS (Equation Operating System)
Cette section décrit l'EOS (Equation Operating System) qu'utilise le labo de maths
TI-Nspire™CAS. Avec ce système, la saisie des nombres, des variables et des fonctions
est simple et directe. Le logiciel EOS évalue les expressions et les équations en
utilisant les groupements à l'aide de parenthèses et en respectant l'ordre de priori
décrit ci-dessous.
Ordre d'évaluation
Niveau Opérateur
1 Parenthèses (), crochets [], accolades {}
2 Indirection (#)
3 Appels de fonction
4 Opérateurs en suffixe : degrés-minutes-secondes (-,',"), factoriel (!),
pourcentage (%), radian (QRS), indice ([]), transposée (T)
5 Élévation à une puissance, opérateur de puissance (^)
6 Négation (L)
7 Concaténation de chaîne (&)
8 Multiplication (¦), division (/)
9 Addition (+), soustraction (-)
10 Relations d'égali : égal à (=), différent de (ƒ ou /=), inférieur à (<),
inférieur ou égal à ({ ou <=), supérieur à (>), supérieur ou égal à (| ou
>=)
11 not logique
12
and logique
13 Logique or
14 xor, nor, nand
15
Implication logique ()
16
Équivalence logique, XNOR ()
17 Opérateur "sachant que" («|»)
18 Stocker (&)
Parenthèses, crochets et accolades
Toutes les opérations entre parenthèses, crochets ou accolades sont calculées en
premier lieu. Par exemple, dans l'expression 4(1+2), l'EOS évalue en premier la partie
de l'expression entre parenthèses, 1+2, puis multiplie le résultat, 3, par 4.
282


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