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calculati: 1+2+3+........+50 ,5+6+7+........+55 ,10+11+12+....+60

Răspuns :

Metoda lui Gauss:
Suma=(1+50)•50:2=51•50:2=51•25=1275
Suma=(5+55)•51:2=60•51:2=30•51=1530
Suma=(10+60)•51:2=70•51:2=35•51=1785