-1 1 setyrange
-2 5 setxrange
250 setwidth
.5 dup setquadrillagestep
quadrillage
/A {2 0} def
/B {3.5 0} def
/M {A A B vecteur -2 mulv addv} def
/N {A A B vecteur 1 3 div mulv addv} def
[M N A B] points
setTimesItalic
(A) A dctext
(B) B dctext
(M) M dctext
(N) N dctext
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