Jawabanmu

2014-05-29T15:04:23+07:00
U3= a+2b 10 = a + 2b U6=a + 5b 22 = a+ 5b Dieliminasikan a+2b = 10 a+5b= 22 Dapetlah b = 4 Terus a + 2(4) = 10 a=2 Sn= n/2 (2a+(n-1)b) S10 = 10/2 (2.2+(10-1)4) = 5(4+36) =5(40) =200
2014-05-29T19:42:56+07:00
 U_{3}  = 10
a+2b = 10
 U_{6} = 22
a+5b = 22
a+2b+3b = 22
10+3b = 22
3b = 12
b = 4

a+2b = 10
a+2×4 = 10
a+8 = 10
a=2

 S_{10} =  \frac{10}{2} (2.2 +(10-1)4) = 5 (4 + 36) = 5 (40) = 200