[tex]V = a \times b \times c = \\
=2 \sqrt{5} \times 5 \sqrt{2} \times \sqrt{18} = \\
=2 \sqrt{5} \times 5 \sqrt{2} \times 3\sqrt{2} = \\
=2 \sqrt{5} \times 5 \times 3(\sqrt{2})^2= \\
=2 \sqrt{5} \times 15 \times 2= \\
=2 \sqrt{5} \times 30= \\
=2 \times 30 \times \sqrt{5} = \\
=60 \sqrt{5} \ \textgreater \ 60 \sqrt{4} =60 \times 2 = 120 ~dm^3 \\ \\
\Longrightarrow ~~ \boxed{V \ \textgreater \ 120~dm^3} \\ \\
1 ~dm^3 = 1~ litru \\ \\
\Longrightarrow ~ \texttt{In acvariu incap mai mult de 120 litrii de apa.}[/tex]
