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a fost răspuns

Aflati termenii sumei: 1,2,2,3,3,3,...,31,31,...,31
                                   

Răspuns :

trebuie să faci așa eu nu voi mai calcula.
1+2×2+3×3+4×4+5×5+6×6+7×7+8×8+9×9+10×10+11×11+12×12+13×13+14×14+15×15+16×16+17×17+18×18+19×19+20×20+21×21+22×22+23×23+24×24+25×25+26×26+27×27+28×28+29×29+30×30+31×31=