Tính: a) 5 – (1+ 1/3): (1-1/3)

b) $\left(1+\frac{2}{3}-\frac{5}{4}\right)-\left(1-\frac{5}{4}\right)+\left(2022-\frac{2}{3}\right)$

= $1+\frac{2}{3}-\frac{5}{4}-1+\frac{5}{4}+2022-\frac{2}{3}$

= $\left(\frac{2}{3}-\frac{2}{3}\right)+\left(-\frac{5}{4}+\frac{5}{4}\right)+\left(1+2022\right)$

= 0 + 0 + 2023

= 2023