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cum calculez(11+22+...+1331)

Răspuns :

11+22+...+1331=11(1+2+3+...+121) = 
11* 121(121+1)/2 =
11*121*122/2 = 
11*121*61 = 
81191 

DAI 11 FACTOR COMUN adica asa 11(1+2+3+...+121)=11(121×122:2)=11×7381=81191

Bafta:P