Question

dau 50 de puncte! Am nevoie! pls!!!!!!!!!!!

Answer 1

a aprtine {1,2,3,4,5,6,7,8,9} deoarece 423/25 =16,92 iar numerele 16,8(1),16,8(2),16,8(3),16,8(4),16,8(5),16,8(6),16,8(7),16,8(8),16,8(9) sunt mai mici decat 16,92

Answer 2

16,8(a)<423/25 (16,8(a) este in baza 10)
16(intregi) (8a-8)/90<423/25 (8a este in baza 10)
16(intregi) (80+a-8)/90<423/25
16  (72+a)/90<423/25
(16*90+72+a)/90<423/25
1512+a/90<423/25 /*5
(1512+a)/18<423/5
5(1512+1<18*423
7560+5a<7614
5a<54
a<54/5
a<10,9=>a={1,2,3,4,5,6,7,8,9}