Đáp án:
A = 2.00198167
Giải thích các bước giải:
A = $\frac{2}{2018}$ x 2020 + $\frac{2021}{2020}$ - $\frac{2019}{2018}$
A = $\frac{4040}{2018}$ + $\frac{2021}{2020}$ - $\frac{2019}{2018}$
A = $\frac{4040}{2018}$ - $\frac{2019}{2018}$ + $\frac{2021}{2020}$
A = $\frac{2021}{2018}$ + $\frac{2021}{2020}$
A = $\frac{4082420}{4076360}$ + $\frac{4078378}{4076360}$
A = $\frac{8160798}{4076360}$
A = 2.00198167
