[tex]\displaystyle\bf\\144\div4\sqrt{3}=\frac{144}{4\sqrt{3}}\\\\Rationalizam~numitorul.~~ (Amplificam~fractia~cu~\sqrt{3})\\\\\frac{144}{4\sqrt{3}}=\frac{144\times\sqrt{3}}{4\sqrt{3}\times\sqrt{3}}=\frac{144\sqrt{3}}{4\times3}=\frac{144\sqrt{3}}{\bf{12}}=\boxed{\bf12\sqrt{3}}[/tex]
