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koefisien suku je 7 adalah
= 9C6 (4x)^(9-6) (-y^3)^6
= 9!/(9-6)!6! (4x)^3 (-y^18)
= - 84(64)
= -5376
5) (2n-1)^3
= (2n)^3 - 3(2n)^2 + 3(2n) - 1^3
= 8n^3 - 12n^2 + 6n - 1