Rút gọn biểu thức:
$C=\frac{2+\sqrt{3}}{\sqrt{2}+\sqrt{2+\sqrt{3}}}+\frac{2-\sqrt{3}}{\sqrt{2}-\sqrt{2-\sqrt{3}}}$
$E=\frac{1+\frac{\sqrt{3}}{2}}{1+\sqrt{1}+\frac{\sqrt{3}}{2}}+\frac{1-\frac{\sqrt{3}}{2}}{1-\sqrt{\frac{\sqrt{3}}{2}}}$
$G=\sqrt{a+b+c+2\sqrt{ac+bc}}+\sqrt{a+b+c-2\sqrt{ac+bc}}$