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11+22+33+44+......7700

Răspuns :

11 + 22 + 33 + 44 + ... + 7700 =

11 × ( 1 + 2 + 3 + ... + 700 ) =

11 × ( 700 × 701 : 2 ) =

11 × ( 490700 : 2 ) =

11 × 245350 = 2698850