1. Tìm x: ( x – 1/2 )^3 = 1/27 2. Tính: 4 . ( 1/4 )^2 + 25 . [ ( 3/4 )^3 : ( 5/4 )^3 ] : ( 3/2 )^3

( 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

=$\frac{1}{10}$