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Determinati numarul "x", astfel incat media aritmetica a numerelor 1,5;2,15; 4,9 si "x"sa fie 3,945.

Răspuns :

(1,5+2,15+4,9+x)/4=3,945
(1,5+2,15+4,9+x)/4=3,945
8,55+x=15,78
x=15,78-8,55=7,23