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Annexe A : Instructions et fonctions 943
Prompt Instruction d'entrée/sortie. Voir chap. VII et chap. 33, manuel CD. Prompt
propFrac() Menu MATH/ Algebra propFrac()
propFrac(
expression1
[,
var
])
expression
Décompose l'expression sous la forme A+B/C.
Quand on utilise cette fonction sur un nombre
rationnel, on obtient A, B et C entiers avec B
entier inférieur à C.
Quand on utilise cette fonction sur une fonction
rationnelle de la variable
var
, on obtient A, B et C
polynômes avec degré de B inférieur à celui de C.
propFrac((x^2+2x-3)/(x-1)) ¸
x+3
propFrac(45/17) ¸ 2+11à17
propFrac(ë 4/3) ¸ ë 1ì 1/3
propFrac((x^2+x+1)/(x+1)+
(y^2+y+1)/(y+1),x) ¸
1
1
1
1
2
x
x
yy
y+
++
++
+
propFrac(ans(1)) ¸
1
1
1
1x
x
y
y
+
++
+
+
PtChg CATALOG PtChg
PtChg
x
,
y
PtChg
xListe
,
yListe
Affiche l'écran graphique et change l'état du pixel
le plus proche du point de coordonnées (
x
,
y
).
Il est possible d'utiliser cette instruction sur une
liste de points dont les coordonnées
sont placées
dans les listes
xListe
et
yListe
.
Les exemples illustrant PtChg à PtText forment
une suite continue.
ClrDraw ¸
PtChg 2,4 ¸
PtOff CATALOG PtNAff
PtOff
x
,
y
PtOff
xListe
,
yListe
Affiche l'écran graphique et efface le pixel le plus
proche du point de coordonnées (
x
,
y
).
Il est possible d'utiliser cette instruction sur une
liste de points dont les coordonnées
sont placées
dans les listes
xListe
et
yListe
.
PtOff 2,4 ¸
PtOn CATALOG PtAff
PtOn
x
,
y
PtOn
xListe
,
yListe
Affiche l'écran graphique et affiche le pixel le plus
proche du point de coordonnées (
x
,
y
).
Il est possible d'utiliser cette instruction sur une
liste de points dont les coordonnées
sont placées
dans les listes
xListe
et
yListe
.
PtOn 3,5 ¸
942


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