Răspuns :
1+2+3+...+56=56*57:2=1596
1+2+3+...+36=36*37:2=666
(1+2+3+...+56)-(1+2+3+...+36)=1596-666=930
1+2+3+...+36=36*37:2=666
(1+2+3+...+56)-(1+2+3+...+36)=1596-666=930