Răspuns:
ma = x + 49,5
Explicație pas cu pas:
a₁ = x ; a₂ = x+1 ; a₃ = x+2 ; a₄ = x+3 ....... a₁₀₀ = x +99
S₁₀₀ = a₁+a₂+a₃+.....+a₁₀₀
S₁₀₀ = x+x+1+x+2+x+3+....+x+99
S₁₀₀ = 100x+(1+2+3+....+99) = 100x + (1+99)·99:2
S₁₀₀ = 100x + 99·50 = 100x + 4950 = 100·(x+49,5)
ma = S₁₀₀/100 =>
ma = x + 49,5
