Răspunsuri

2014-10-28T17:00:59+02:00
S=[ (A1 +An ) . n] :2 = [( 5+104).104]:2 = (109.104):2=11336:2=5668
se imparte si la 2
si de unde ai scos 109 si 50
104+5=109 , 5+6+7+...+103+104 de aici vine 100 de numeri si 100/2
E correct al Ioanei...
corect*
2014-10-28T17:15:30+02:00
S=[(5+104)xnr. termeni]:2
nr.termeni=(104-5):1+1
=99:1+1
100
s=[(5+104)x100]:2
s=(109x100):2
s=10900:2
s=5450