Tính

A=\(\left(7\sqrt{48}+3\sqrt{27}-2\sqrt{12}\right)\sqrt{3}\)

B=\(\left(12\sqrt{50}-8\sqrt{200}+7\sqrt{450}\right):\sqrt{10}\)

C=\(\left(2\sqrt{6}-4\sqrt{3}+5\sqrt{2}-\dfrac{1}{4}\sqrt{8}\right)3\sqrt{6}\)

Rút gọn

A=\(\dfrac{2}{x^2-y^2}\sqrt{\dfrac{3y^2+6xy+3y^2}{4}}\)

B=\(\dfrac{1}{2a-1}\sqrt{5a^4\left(1-4a+4a^2\right)}\)

Rút gọn

A=\(\left(x^2-4\right)\sqrt{\dfrac{9}{x^2-4x+4}}\) với x>2

B=\(\dfrac{8y^2}{x^2-9}\sqrt{\dfrac{\left(x-3\right)^2}{y^2}}\) với x<3,y>0