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------ + 4a × ----
a^2 12
6 a^2
----- + ------
a^2 3
18 + a^4
------------
3a^2
2. 9 16
-- + 4 × a^2 - ----
a 3
9 16
-- + 4a^2 - ----
a 3
27 + 12a^3 - 16a
------------------------
3a
kalau gak salah ya