rút gọn A)\(\sqrt{\sqrt{5}-\sqrt{3-\left(2\sqrt{5-3}\right)^2}}\)
B) \(\sqrt{6+2\sqrt{5-\sqrt{\left(2\sqrt{3+1}\right)^2}}}\)
C) \(\sqrt{4+\sqrt{5\sqrt{3}+5\sqrt{48-10\sqrt{\left(2+\sqrt{3}\right)^2}}}}\)

bà 1 rút gọn biểu thức :\(\sqrt{9ab}\) + 7\(\sqrt{\dfrac{a}{b}}\) - 5\(\sqrt{\dfrac{b}{a}}\) - 3ab \(\sqrt{\dfrac{1}{ab}}\)

bài 2 :cho a>0,b>0 chứng minh : \(\dfrac{a^2b}{a-b}\).\(\sqrt{\dfrac{8\left(a^2-2ab+b^2\right)}{75a^4b}}\) = \(\dfrac{2}{15}\) .\(\sqrt{6b}\)