Tính giá trị biểu thức:

a) $\frac{9^{3} \times 2^{10}}{16^{2} \times 81^{2}} = \frac{3^{6} \times 2^{10}}{2^{8} \times 3^{8}} = \frac{2^{2}}{3^{2}} = \frac{4}{9}$

b) $\frac{(- 3)^{7} \times (- 3)^{8}}{7 \times 9^{7}} = \frac{(- 3)^{15}}{7 \times 9^{7}} = \frac{- 3^{15}}{7 \times 3^{14}} = \frac{- 3}{7}$

c) $\frac{(0.3)^{6} \times (0.04)^{3}}{(0.09)^{4} \times (0.2)^{4}} = \frac{(0.3)^{6} \times (0.2)^{6}}{({0.3}^{8} \times (0.2)^{4}} = \frac{4}{9}$

d) $\frac{2^{3} + 2^{4} + 2^{5} + 2^{6}}{15^{2}} = \frac{120}{15} = \frac{8}{15^{2}}$