[tex]a)V = 27 \: {cm}^{3} [/tex]
[tex]V = {l}^{3} [/tex]
[tex] {l}^{3} = 27[/tex]
[tex] {l}^{3} = {3}^{3} = > l = 3 \: cm[/tex]
[tex]b)V = 0.008 \: {m}^{3} [/tex]
[tex]V = {l}^{3} [/tex]
[tex] {l}^{3} = 0.008[/tex]
[tex] {l}^{3} = {0.2}^{3} = > l = 0.2 \: m[/tex]
[tex]c)V = 64 \: {dm}^{3} [/tex]
[tex]V = {l}^{3} [/tex]
[tex] {l}^{3} = 64[/tex]
[tex] {l}^{3} = {4}^{3} = > l = 4 \: dm[/tex]