Rationalizing the denominator can make it easier to recognize “like terms” in expressions. 
For example, $\sqrt { 2 }$ and $\frac { 1 } { \sqrt { 2 } }$ can be combined if $\frac { 1 } { \sqrt { 2 } }$ is rewritten as $\frac { 1 } { \sqrt { 2 } } \cdot \frac { \sqrt { 2 } } { \sqrt { 2 } } = \frac { \sqrt { 2 } } { 2 }$.
Then $\sqrt{2}+\frac{1}{\sqrt{2}}=$$\sqrt{2}+\frac{\sqrt{2}}{2}=\frac{3\sqrt{2}}{2}$.
Use this method to combine the like terms of each radical expression below.