Jawabanmu

2014-04-24T20:30:31+07:00
A+b=11 a+2b = 12 ------- - -b = -1 b = 1 a + b = 11 a + 1 = 11 a = 10 U100 = 10 + (99)1 = 10 + 100 = 110 maaf kalo salah
2014-04-24T20:42:37+07:00
Un= an +b
U2= 2a + b=11
U3=3a + b =12  _
       -1a    = -1
         a     = 1 
2a + b =11 
2 (1) +b =11 
2+b=11 
b = 11-2 = 9 


U100 = 100(1) +9 
        = 109