Phân tích thành nhân tử

a) \(a-3\sqrt{a+4}\)

b) \(\sqrt{-5x+x^2+6}+\sqrt{x-2}\)

Rút gọn:

\(\left(\sqrt{8}-3\sqrt{2}+\sqrt{10}\right)\left(\sqrt{2}-3\sqrt{0,4}\right)\)

Rút gọn:

\(M=\dfrac{x+2+\sqrt{x^2-4}}{x+2-\sqrt{x^2-4}}+\dfrac{x+2-\sqrt{x^2-4}}{x+2+\sqrt{x^2-4}}\)

Rút gọn:

\(M=\dfrac{x+2+\sqrt{x^2-4}}{x+2-\sqrt{x^2-4}}+\dfrac{x+2-\sqrt{x^2-4}}{x+2+\sqrt{x^2-4}}\)

Rút gọn

A= \(\sqrt{5-\sqrt{3+\sqrt{48}}}\)

B= \(\dfrac{\sqrt{8-\sqrt{15}}}{\sqrt{30}-\sqrt{2}}\)

C= \(\dfrac{1}{\sqrt{3}+1}-\dfrac{1}{\sqrt{3}-\sqrt{2}}\)

Rút gọn

A= \(\sqrt{5-\sqrt{3+\sqrt{48}}}\)

B= \(\dfrac{\sqrt{8-\sqrt{15}}}{\sqrt{30}-\sqrt{2}}\)

C= \(\dfrac{1}{\sqrt{3}+1}-\dfrac{1}{\sqrt{3}-\sqrt{2}}\)

Rút gọn

A= \(\sqrt{5-\sqrt{3+\sqrt{48}}}\)

B= \(\dfrac{\sqrt{8-\sqrt{15}}}{\sqrt{30}-\sqrt{2}}\)

C= \(\dfrac{1}{\sqrt{3}+1}-\dfrac{1}{\sqrt{3}-\sqrt{2}}\)