Jawabanmu

2014-06-24T15:01:35+07:00
U2 = 11 a+b = 11(dikali 4) => (4a+4b=44) s4 = 52 4/2(2a+(4-1)b) = 52 2(2a+3b)=52 4a+6b = 52 4a+4b=44 --------eliminasi b=4 a=7 s8=8/2(2(7)+(8-1)7) s8=168 b.168
2014-06-24T15:03:04+07:00
Deret : 7 11 15 19
S8 : 8/2 (2.7 + 7.14) = 168