Jawabanmu

2014-03-06T14:33:17+07:00
Itu deret aritmatika
a = 2x-1
b = -1
n = 99

Sn = n/2(2a + (n-1)b)
S99 = 99/2(2(2x-1) + (99-1)(-1))
600 = 99/2(4x-2-98)
1200 = 99(4x-100)
1200 = 396x - 9900
396x = 11100
x = 28 (dibulatkan)

CMIIW :3