Jawabanmu

Jawaban paling cerdas!
2014-02-05T17:40:38+07:00
U5+U8 = a+(5-1)b + a+(8-1)b = 96
=a+4b+a+7b =96
=2a+11b =96

U4 = a+(4-1)b=33
=a+3b =33

2a+11b=96
  a+3b =33
disamakan penyebut menjadi
2a+11b=96
2a+6b =66
___________ -
     5b =30
       b= 6

a+3b =33
a+3.6 =33
a+18 =33
a =33-18 =15

jadi..
U15 = a+(n-1)b
=15+(15-1)6
=15+14.6
=99 :)

thank you ya.. makasih banget..
iyya.. sama2 :)