Ta có:

a) $(\frac{5}{13})^{4} . \frac{5}{26} . \frac{10}{13}$

=  $(\frac{5}{13})^{4} . \frac{5}{13.2} . \frac{5.2}{13}$

= $\frac{5}{13}^{4} . \frac{5}{13} . \frac{5}{13}$

=$\frac{5}{13}^{6}$

b) $(\frac{−3^{4}}{4} . (0,75)^{3} $

= $(\frac{3^{4}}{4} . (0,75)^{3} $

=$(0,75)^{4} . (0,75)^{3}$

= $(0,75)^{7}$

c) $(−0,36)^{3} : \frac{−25}{9}$

= $(\frac{−9}{25})^{3} . \frac{−9}{25}$

= $\frac{9}{25}^{4}$

=$[(\frac{3}{5})^{2}]^{4}  = (\frac{3}{5})^{8}$

d) $4 . 2 : (2^{3} . \frac{1}{16})$

= $2^{2} . 2 : \frac{2^{3}}{16}$ 

= $2^{2} . 2 . \frac{2^{4}}{2^{3}}$

= $2^{2} . 2 . 2 =  2^{4}$.