[tex]x^5-2019x^4+2020x^3-2023x^2+2017x\\\\\ =x^5-2018x^4-x^4+2018x^3+2x^3-4036x^2+2013x^2-2013.2018x+(2019.2012+2013)x\\\\ =(2019.2012+2013).2018[/tex]
giờ dùng máy tính chi thuật là ok....
[tex]x^5-2019x^4+2020x^3-2023x^2+2017x\\\\\ =x^5-2018x^4-x^4+2018x^3+2x^3-4036x^2+2013x^2-2013.2018x+(2017.2012+2013)x\\\\ =(2017.2012+2013).2018[/tex] [tex]x^5-2019x^4+2020x^3-2023x^2+2017x\\\\\ =x^5-2018x^4-x^4+2018x^3+2x^3-4036x^2+2013x^2-2013.2018x+(2017.2012+2013)x\\\\ =(2017.2012+2013).2018[/tex]
giờ dùng máy tính chi thuật là ok....