Question

Sa se determine termenii a1,a2,aa3 ai progresiei aritmetice:
a)a1,a2,a3,-4,-14\3,-16\3,...
b)a1,a2,a3,-1,-1\2,2,...
Rezolva completa va rog!!!

Answer 1

ratia r = a ₅  - a₄ =  -14 /3 - ( -4) = -14/3  + 4 = -2/3 
a₃ = a₄ - r = -4 -( -2/3) = -4 + 2/3 = -10 /3 
a₂ = a₃ -r = -10/3 - ( -2/3) = -10/3 + 2/3  = - 8/3
a₁ = a₂ -r = -8/3 - ( -2/3) = -8/3 + 2/3 = - 2

b.    ratia r = a₅ - a₄ = = - 1/2 - ( -1 ) = -1/2  + 1 = 1/2 
a₃ =a₄ -r = -1 -1/2 = -3/2 
a₂=a₃ -r = -3/2 - 1/2 = -2 
a₁=a₂ -r = -2 -1/2 = -5/2