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penyelesaian :
pertama cari kombinasi..
₉C₆ = 9.8.7.6! ( angka 6! dicoret )
3.2! 6!
= 504
6
= 84
trus..
84 . x⁶ (-3)³ = 84 . -27 x⁶ = - 2268 x⁶
jadi, koefisien dari x⁶ = -2268