Jawabanmu

2014-04-03T21:29:54+07:00
A= 8 b=5 jadi Un= a+(n-1)b = 8+(n-1)5 = 8+5n-5 =3+5n
2014-04-03T21:38:21+07:00
A= 8 ; b= 5
rumus barisan aritmatika:
Un= a+{n-1)b
Un= 8+(n-1)5
Un= 8+5n-5
Un= 3+5n