Question

Answer 1

\(=\left(2021\cdot1998+2021+1997\right)\cdot\left(1+\dfrac{1}{2}\cdot\dfrac{2}{3}-\dfrac{4}{3}\right)\)

\(=0\)

Answer 2

\(\left(2021\cdot1998+2021+1997\right)\cdot\left(1+\dfrac{1}{2}:1\dfrac{1}{2}-1\dfrac{1}{3}\right)\)

\(=\left(2021\cdot1998+2021+1997\right)\cdot0=0\)