Jawabanmu

2014-03-21T22:17:54+07:00
Un = a + (n-1)b
Sn = n/2(a + Un)
Ut = 1/2(a + Un)
b' = y - x / 1 + k
n' = n(k + 1) - k
1 2 1
2014-03-21T22:23:06+07:00
U2=a + b
U3=U2 + b = (a + b) + b = a + 2b
U4=U3 + b = (a + 2b) + b = a + 3b
U5=U4 + b = (a + 3b) + b = a + 4b

sorry klo salah.......
1 5 1