giải giúp mình nha!!!!!!!!!!!
bài 1: Rút gọn
C= \(\sqrt{x-2-2\sqrt{x-3}}-\sqrt{x-1-4\sqrt{x-3}}\)
D= \(\sqrt{m^2}-\sqrt{m^2-10m+25}\)
bài 2: chứng minh
a) \(\sqrt{x+2\sqrt{x-2}-1}.\left(\sqrt{x-2}-1\right):\left(\sqrt{x}-\sqrt{3}\right)=\sqrt{x}+\sqrt{3}\)
b)\(\left(\frac{1}{a-\sqrt{a}}+\frac{1}{\sqrt{a}-1}\right):\frac{\sqrt{a}+1}{a+1-2\sqrt{a}}=\frac{\sqrt{a}-1}{\sqrt{a}}\)