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Exercitiul 6


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Exercitiul 6 class=

Răspuns :

[tex] \frac{2*(1+2+3+...+40)}{3*(1+2+3+...+40)} [/tex]=[tex] \frac{2*1+2*2+2*3+...+2*40}{3*1+3*2+3*3+...+3*40} [/tex]