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101+202+303+.........+9999

Răspuns :

9999×(9999+1)= 9999×10000=99990000
1+2+3+ ..... +100 =100×(100+1)=100×101=10100
99990000-10100=99979900
Se numeste operatia pe care am facut- o Suma Gauss ( suma gaos)

SPER CA TE- AM AJUTAT!