Răspunsuri

2014-09-28T19:35:08+03:00
80*81/2= 40*81= 3240
100*101/2= 50*101= 5050
99*100/2= 99*50= 4950
501*502/2= 501*251= 125751
1000*1001/2= 500*1001= 500500