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b = ar
c = ar^2
1/a + 1/ar + 1/ar^2 = r^2/ar^2 + r/ar^2 + 1/ar^2 =
( r^2 + r + 1 )1/ar^2
jadi hasilnya
r^2 + r + 1
________
ar^2
kalo bisa disederhakan , silkan disederhanakab lagi