101+10101++1010101=10202+1010101=1020303
2)11+12+13+14+15+95+96+97+98+99=550
3)1+2+....+500=(45+145+245+345+445+545+645+745+845+945+1)x5=4951x5=24755
1..9 sua este 45
10.....19 este145
20.....29este 245
30.......39este345
40.......49 este445
50.......59 este545
60.....69 este645
70.....79 este745
80.....89 este845
90......99 este945
e cel mai bun raspuns?marcheaza-l.mltumesc.
