Question

care este rezultatul calcului
1-2+3-4+5-6+..........+19-20=....
cine stie si raspunde corect primul ii voi da coroana

Answer 1

1-2+3-4+5-6+7-8+9-10+11-12+13-14+15-16+17-18+19-20= -10

Answer 2

1-2+3-4+5-6+7-8+9.........-18+19-20
1+3+5+7+9+11+13+15+17+19=100
-2-4-6-8-10-12-14-16-18-20=-110
100-110=-10