Đáp án:
`P (x) = x^17 - 1999 x^16 - x^16 + 1999 x^15 + x^15 - 1999 x^14-......................+ 1999x + x -1`
`P (1999) =1999^17 - 1999^17 -1999^16 + 1999^16 + ............................+ 1999² +1999 -1`
`P (1999) = 1999 - 1=1998`
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