( x - $\frac{1}{2}$ )^3 = $\frac{1}{27}$
( x - $\frac{1}{2}$ )^3 =($\frac{1}3)^{3}$
x - $\frac{1}{2}$=$\frac{1}{3}$
x=$\frac{5}{6}$
( $\frac{1}{4}$ )^2 + 25 . [ ( $\frac{3}{4}$ )^3 : ($\frac{5}{4}$ )^3 ] : ( $\frac{3}{2}$ )^3
=( $\frac{1}{4}$ )^2 +$5^{2}$ .(($\frac{2}{5}$) ^3
=$\frac{1}{10}$