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56+57+58+......+189+190=

Răspuns :

56 + 57 + 58 + ........... + 189 + 190 =  16 605

→ stabilesc cati termeni are suma cu ratia = 1

190 - 56 + 1 = 135 termeni are suma

→ aplic formula sumei lui Gauss

= 135 × ( 56 + 190 ) : 2 =

= 135 × 246 : 2 =

= 135 × 123 =

= 16 605