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Rezolvati urmatorul exercitiu(sume gauss)
S=1+2+3+4+.......+47+48+49


Răspuns :

pai 1+2+2+3+4...+47+48+49
49+48+47+...+1
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2a=50+50+50+50+...+50
de 49 ori
a=49×50:2
a=49×25
a=1225