Jawabanmu

Jawaban paling cerdas!
2014-05-28T05:20:07+07:00

mula-mula cari b..
Un=a+(n-1)b
U20=a + (20-1)b
      =a+19b

b=a+19b=59
   2+19b=59
       19b=59-2
       19b=57
          b=57/19
          b=3

jadi, U5=2+(5-1)3
           = 2+4x3
           =14
2 5 2
2014-05-28T05:25:53+07:00
U1=2
U20=59
59-2/20-1= 57/19=3 (b)
Un=a+(n-1)b
U5=2+(5-1)3
U5=2+12
U5=14