Tính:

a) $(- \frac{2}{3})^{3} \times (- \frac{2}{3})^{2} = (- \frac{2}{3})^{5} = \frac{- 32}{243}$

b) $(0.15)^{7} / (0.15)^{5} = (0.15)^{2} = 0.0225$

c) $(\frac{3}{5})^{15} / (\frac{27}{125})^{5} = (\frac{3}{5})^{15} / (\frac{3}{5})^{15} = 1$

d) $(\frac{1}{7})^{4} \times \frac{1}{7} \times 49^{3} = (\frac{1}{7})^{4} \times \frac{1}{7} \times 7^{6} = 7$