Phân tích đa thức thành nhân tử: x^2 - x - 2020.2021
Giải thích
x2 – x – 2020.2021
= x2 + 2020x – 2021x – 2020.2021
= x(x + 2020) – 2021(x + 2020)
= (x + 2020)(x – 2021)
x2 – x – 2020.2021
= x2 + 2020x – 2021x – 2020.2021
= x(x + 2020) – 2021(x + 2020)
= (x + 2020)(x – 2021)