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Andreea are notele 10, 9, 8 si 7 in teza. Va avea ea media 9?

Răspuns :

(10+9+8) : 3=27:3=9
(9*3+7) :4=34:4=8.5
rotunjit 9
pai facem 10+9+8+7=34
34:4=8.50 se rotunjeste asa ca da