`x^{5}-2018x^{4}+2016x^{3}+2018x^{2}-2016x-2017` `PTĐT TNT`

1 bình luận về “`x^{5}-2018x^{4}+2016x^{3}+2018x^{2}-2016x-2017` `PTĐT TNT`”

1. x^5-2018x^4+2016x^3+2018x^2-2016x-2017

   =x^5-2017x^4-x^4+2017x^3-x^3+2017x^2+x^2-2017x+x-2017

   =(x^5-2017x^4)-(x^4-2017x^3)-(x^3-2017x^2)+(x^2-2017x)+(x-2017)

   =x^4(x-2017)-x^3(x-2017)-x^2(x-2017)+x(x-2017)+(x-2017)

   =(x-2017)(x^4-x^3-x^2+x+1)

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