Đáp án:
Ta có:
`f(x) =x^4 - 2018 x^3 + 2018 x^2 - 2018x +2017`
`f(x) = x^4 - 2017 x^3 - x^3 + 2017 x^2 + x^2 - 2017x - x + 2017`
`f(2017) = 2017^4 - 2017 . 2017^3 - 2017^3 + 2017 . 2017^2 + 2017^2 -2017 . 2017 - 2017 + 2017`
`f(2017) = 2017^4 - 2017^4 - 2017^3 + 2017^3 + 2017^2 - 2017^2 - 2017 + 2017`
`f(2017)=( 2017^4 - 2017^4) - ( 2017^3 -2017^3) + (2017^2 - 2017^2) - ( 2017-2017)`
`f(2017) = 0 - 0 + 0 - 0`
`f(2017)=0`
`text{ XIN HAY NHẤT NHA}`
@toanisthebest
