Răspuns :
2+3+...+11=65
(1+2+3...+11)-1=(11*12:2)-1=11*6-1=66-1=65
(1+2+3...+11)-1=(11*12:2)-1=11*6-1=66-1=65
Sgauss = 1+2+..n = n(n+1)/2
2+3+..11 = 1+2+...+11-1 = 11x12/2 - 1 = 66 - 1 =65
2+3+..11 = 1+2+...+11-1 = 11x12/2 - 1 = 66 - 1 =65