\( \frac{\frac{3}{4}+1 \frac{5}{7} \text { of } 2 \frac{1}{3}}{\left(1 \frac{3}{7}-\frac{5}{8} \times \frac{2}{3}\right)} \)

4. Tính bằng cách thuận tiện. a) \( 25360+5300+4700+4540= \)

4. Which of the following years are leap years? 5 \( 1876,1900,1988,2000,2002,2010,1998,1996,2004 \) Olympic Games are held every four years. They were held in 2016, When Games be held? Are these years leap years? \( 2016,2020,2024,5 e 8 \) How many days are there in \( \begin{array}{ll}\text { (a) } 1 \text { week } 3 \text { days? } 10 & \text { (b) } 3 \text { weeks? } 21 \\ \text { (c) } 3 \text { weeks } 4 \text { days? } 25 & \text { (d) } 4 \text { weeks } 6 \text { days? } 34\end{array} \)

4. \( 3 \times .3 \times .03 \times .003 \times 30= \) ? \( \begin{array}{ll}\text { (a) } 0.000243 & \text { (b) } 0.00243 \\ \text { (c) } 0.02430 & \text { (d) } 0.0000243\end{array} \)

(3) \( \left[\left(-\frac{5}{9}+\frac{4}{3}\right): \frac{7}{27}-\frac{15}{4} \cdot\left(\frac{8}{3}-\frac{1}{12}+\frac{7}{2}-\frac{11}{4}\right)+5\right] \cdot\left\{\left[\frac{5}{12}:\left(\frac{1}{4}-1\right)+\frac{3}{2}\right] \cdot \frac{2}{17}\right\} \)

If \( 3^2 \) is calculated, what is the result?