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Ce inseamna semnul asta exemplu
[AB], (AB), [AB, (AB etc...?


Răspuns :

[ab]-segmen inchis
(ab)-segment deschis
(ab-semidreapta deschisa
[ab-semidreapta inchisa

[AB], segment inchis
(AB),segment deschis
 [AB, semidreapta inchisa
(AB semidreapta deschisa