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Dianastuparu16
a fost răspuns

Se considera A=3n+2/16 unde n apartine N.
a) Determinati cel mai mic nr natural n pt care A > 3/8
b) Determinati suma tuturor numerelor naturale n pt care A < 10

Răspuns :

Mikkka
a)

3/8= 6/16⇒ 3n+2/16 > 6/16⇒ 3n+2 >6⇒ 3n > 4⇒ n > 4/3⇒ n=2

b)
10 = 160/16⇒ 3n+2< 160⇒ 3n< 158⇒ n<158/3⇒ n∈{0,1,2,3..,52}
S = 1+2+3+..+52= 52*53 :2=1378

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