\[\boxed{\mathbf{486}.}\]
\[1)\ x^{\sqrt{3}} \bullet x^{1 - \sqrt{3}} = x^{\sqrt{3} + 1 - \sqrt{3}} =\]
\[= x^{1} = x;\]
\[2)\ a^{1 - \sqrt{2}} \bullet a^{\sqrt{2} + 1} =\]
\[= a^{1 - \sqrt{2} + \sqrt{2} + 1} = a^{2};\]
\[3)\ \left( b^{\sqrt{5}} \right)^{\sqrt{5}}:b^{2} = b^{5}\ :b^{2} =\]
\[= b^{5 - 2} = b^{3}.\]