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b = 2
S5 =
135 =
135 = -----semua ruas di kali 2
270 = 5(2a + 8)
270 = 10 a + 40
270 - 40 = 10 a
230 = 10 a
a = 23
jumlah 2 bilangan terbesar berarti U4 dan U5
U4 = 23 + 6 = 29
U5 = 23 + 8 = 31
------ +
60