Simplify the following:
 
1. \(10\sqrt{6}+5\sqrt{216}+\frac{4}{\sqrt{6}}\)  \(=\) ii6
 
2.  \( (\sqrt{6}-\sqrt{4})^2\)  \(=\) i2i
 
3.  \( \frac{2\sqrt{6}}{3}-\frac{\sqrt{6}}{6}\)  \(=\) ii