Tính nhanh: 2 * 3/7 + ( 2/9 - 3/7 ) - 5/3 : 1/9

$$\begin{gathered} \mathrm{Câu} 1: \mathrm{Tính} \mathrm{nhanh} \\ \mathrm{a}) 2\times \frac{3}{7}+\left(\frac{2}{9}-1\frac{3}{7}\right)-\frac{5}{3}÷\frac{1}{9} \\ \mathrm{b}) \left(\frac{377}{‐231}-\frac{123}{89}+\frac{34}{791}\right)\times \left(\frac{1}{6}-\frac{1}{8}-\frac{1}{24}\right) \\ \mathrm{giúp} \mathrm{mk} \mathrm{vs} \mathrm{ạ} \mathrm{mk} \mathrm{đg} \mathrm{cần} \mathrm{gấp} \\ \mathrm{ai} \mathrm{nhanhh} \mathrm{mk} \mathrm{chaams} \mathrm{cho} \mathrm{e} \mathrm{điểm} \end{gathered}$$