Jawabanmu

2014-01-27T23:33:17+07:00
2) a=-7
b=-4
Un = a + ( n-1)b
= -7+(n-1)-4
= -7-4n+4
= -4n-3


2014-01-28T02:40:01+07:00
No 1
a = 5/2
b = 3/2

U31 = a + 30b
= 5/2 + 30. 3/2 = 47,5