Răspunsuri

2014-11-07T14:57:06+02:00
2014-11-07T15:06:24+02:00
S1=80*81/2=40*81=3240

S2=(99+1)*n/2 unde n este nr de numere
n=(99-1):2+1=98:2+1=49+1=50
S2=100*50/2=50*50=2500