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Cum se calculeaza 13000+18000+23000+... + 53000+58000=

Răspuns :

13000+18000+23000+... + 53000+58000 = (13000+58000)x10:2 =

= 71000 x 5 = 355000

a₁ = 13000 ; aₓ = 58000

x = numarul de termeni = (58000-13000)/5000 +1 = 10 numere

Formula=(a₁+aₓ)* x/2