Cách làm cho bạn:
a) $5-\left ( 1+\frac{1}{3} \right ): \left ( 1-\frac{1}{3} \right )$
=$5-\frac{4}{3}:\frac{2}{3}$
=$5-\frac{4}{3}.\frac{3}{2}$
= $5-2 = 3$
b) $\left ( 1+ \frac{2}{3}-\frac{5}{4} \right ) - \left ( 1-\frac{5}{4} \right )+2022-\frac{2}{3}$
= $\left ( 1- \frac{5}{4} \right )+\frac{2}{3}- \left ( 1-\frac{5}{4} \right )+2022-\frac{2}{3}$
= 2022
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