

Rút gọn
A = [tex]\frac{1}{\sqrt{3+2\sqrt{2}}}+\frac{1}{\sqrt{5+2\sqrt{6}}}+\frac{1}{\sqrt{7+2\sqrt{12}}}+...+\frac{1}{\sqrt{199+2\sqrt{9900}}}[/tex]
A = [tex]\frac{1}{\sqrt{3+2\sqrt{2}}}+\frac{1}{\sqrt{5+2\sqrt{6}}}+\frac{1}{\sqrt{7+2\sqrt{12}}}+...+\frac{1}{\sqrt{199+2\sqrt{9900}}}[/tex]