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Va R0G plzZ ajutatima Calculati!
1+2+3+4+......+53
MultumeSc


Răspuns :

[tex]\displaystyle 1+2+3+4+...+53= \frac{53(53+1)}{2} = \frac{53 \times 54}{2} = \frac{2862}{2} =1431[/tex]