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s8 = 3060
---> coret a dan (1-r)
----> dijabarkan selisih kuadrat
-----> coret yg sama
3060/2880 = 1 + r^4
1,0625 = 1 + r^4
1,0625 - 1 = r^4
0,0625 =r^4
r =
r = 0,5
cari a pakai S4
2880 =
2880 =
2880 = 1,875 a
a = 1536