Răspuns:
[tex]\frac{1}{\sqrt{11} } =\frac{1*\sqrt{11} }{\sqrt{11} *\sqrt{11} }=\frac{\sqrt{11} }{(\sqrt{11} )^{2}}=\frac{\sqrt{11} }{11} \\\frac{1}{3\sqrt{3} }=\frac{\sqrt{3} }{3*(\sqrt{3})^{2} }=\frac{\sqrt{3} }{3*3}=\frac{\sqrt{3} }{9}[/tex]
Explicație pas cu pas: