Răspunsuri

2014-04-22T18:00:12+03:00
2014-04-22T18:06:06+03:00
A2=a1+r=>a1=a2-r=5-3=2
a8=a1+7r=2+7*3=23
an=a1+(n-1)r, an-a indice n, a n-lea termen al progresiei; a1-primul termen al progresiei , r-ratia