Jawabanmu

2014-01-17T21:18:26+07:00
Yuhu, baru deh ngerti maksud soalnya :D
itu deret simetris ya?
beda = ( plus-minus)4

n = 2(128/4)+1 = 2(32) + 1 = 64 + 1 = 65

jumlah deret = 16(128+4) x 2 = 16(132) x 2 = 4224
2014-01-17T21:22:09+07:00
N=-36 Sn = n/2(2a(n-1)b) -36/2 ( 2.12(-36-1)4 -18(24-134) -18.-110 1980 = sn