[tex]\it E= \left[\sqrt[ 3]9 \right] -3\left\{-\dfrac{1}{3}\right\}
[/tex]
[tex]\sqrt[3]8 \ \textless \ \sqrt[3] {9} \ \textless \ \sqrt[3]{\it 27} \Rightarrow \it2\ \textless \ \sqrt[3] {9} \ \textless \ 3 \Rightarrow \left[\sqrt[3] {9}\right] =2[/tex]
[tex]\it \left\{-\dfrac{1}{3}\right\} = -\dfrac{1}{3}-\left[-\dfrac{1}{3}\right] = -\dfrac{1}{3} - (-1) =-\dfrac{1}{3} +1 =\dfrac{2}{3}[/tex]
[tex]\it E= 2-3\cdot\dfrac{2}{3} =2 - 2 =0[/tex]