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= 12! / 9! . 3! . 1 . -8x³
= 12.11.10 / 6 . -8x³
= 220 . -8x³ = -1760 x³
koefisiennya yaitu -1760
2. 20C11 . (x^2)^7 . (1/x)^3
= 167960 . x^14 . x^-3
= 167960 x^11
koefisiennya yaitu 167960
maaf kalau salah