Question

Answer 1

\(=\left(\dfrac{-3}{4}+\dfrac{-1}{4}+\dfrac{3}{5}+\dfrac{2}{5}\right)\cdot\dfrac{2022}{2021}=0\)

Answer 2

\(\left(\dfrac{-3}{4}+\dfrac{3}{5}\right):\dfrac{2021}{2022}+\left(\dfrac{2}{5}+\dfrac{-1}{4}\right):\dfrac{2021}{2022}\)

\(=\left(\dfrac{-3}{4}+\dfrac{3}{5}\right)\cdot\dfrac{2022}{2021}+\left(\dfrac{2}{5}+\dfrac{-1}{4}\right)\cdot\dfrac{2022}{2021}\)

\(=\dfrac{2022}{2021}\cdot\left(\dfrac{-3}{4}+\dfrac{3}{5}+\dfrac{2}{5}+\dfrac{-1}{4}\right)\)

\(=\dfrac{2022}{2021}\cdot0\)

\(=0\)