[tex]\displaystyle\bf\\\frac{\sqrt{4} }{\sqrt{11} } =\frac{2}{\sqrt{11} } =\frac{2\cdot\sqrt{11} }{\sqrt{11} \cdot\sqrt{11} } =\frac{2\sqrt{11} }{(\sqrt{11} )^{2} } =\frac{2\sqrt{11} }{11}[/tex]