Tính:

A=\(\sqrt{3-2\sqrt{2}}-\sqrt{3+2\sqrt{2}}\)

Tìm x, biết

a) \(\dfrac{\sqrt{x+1}}{\sqrt{x-1}}=2\)

b) \(\dfrac{\sqrt{x-1}}{\sqrt{x+1}}=2\)

 Tính :

a) A= \(\sqrt{\sqrt{3}+\sqrt{2}}.\sqrt{\sqrt{3}-\sqrt{2}}\)

b)  B=\(\sqrt{5-2\sqrt{6}}+\sqrt{5+2\sqrt{6}}\)

c) C= \(3-\sqrt{3-\sqrt{5}}\)

 Rút gọn

\(\sqrt{3-2\sqrt{2}}-\sqrt{3+2\sqrt{2}}\)