Bài 1. Tính. a) \(\left( \frac{1}{2} - \frac{13}{14} \right) : \frac{5}{7} - \left( \frac{2}{21} + \frac{1}{7} \right) 5 \) b) \( 3 - \frac{5}{1} \cdot \frac{3}{15} + 3 \cdot \left( -\frac{1}{3} - \frac{1}{15} \right) \) c) \([6 + 2 \cdot (3^3 - 17)] : 2\) d) \(\left( \frac{2}{3} + \frac{1}{2} \right)^2 - \frac{6}{5} + \frac{1}{5}\) Bài 2. Tính. a) \(\left( \frac{5}{2} \right) \left( \frac{4}{5} \right) ; \) b) \(\left( -3 \right)^{10} \cdot 15^5 \cdot 25^3 \cdot \left( -9 \right)^7\) c) \(\left( \frac{1}{9} \right)^{\frac{1}{3}}\) d) \(\left( \frac{9}{5} \right)^{2} - \left( \frac{27}{-20} \right)^{2}\)