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Coroana ! ! ! Calculati in Formula lui Gauss :
a ) 1 + 2 + 3 + . . . + 157


Răspuns :

[tex]\displaystyle 1+2+3+...+157= \frac{157(157+1)}{2} = \frac{157 \times 158}{2} = \frac{24806}{2} =12403[/tex]