Răspuns:
[tex]\sqrt{2} = \sqrt{2}\\\\\sqrt{8} =\sqrt{4*2}=\sqrt{(2)^{2}*2 }=2\sqrt{2}\\\\\sqrt{72} =\sqrt{36*2}=\sqrt{(6)^{2}*2 } =6\sqrt{2} \\\\\frac{\sqrt{2}+2\sqrt{2}+6\sqrt{2} }{3} =\frac{9\sqrt{2} }{3} =3\sqrt{2} =\sqrt{(3)^{2}*2} }=\sqrt{9*2}=\sqrt{18}[/tex]
