Question

Tính nhanh A =2021 phần 2022 x 7 phần 8 + 2021 phần 2022 x 3 phần 8 - 2021 phần 2022 x 1 phần 4

Answer 1

\(A=\dfrac{2021}{2022}\times\dfrac{7}{8}+\dfrac{2021}{2022}\times\dfrac{3}{8}-\dfrac{2021}{2022}\times\dfrac{1}{4}\)

\(A=\dfrac{2021}{2022}\times\left(\dfrac{7}{8}+\dfrac{3}{8}-\dfrac{1}{4}\right)\)

\(A=\dfrac{2021}{2022}\times\left(\dfrac{7}{8}+\dfrac{3}{8}-\dfrac{2}{8}\right)\)

\(A=\dfrac{2021}{2022}\)