Giải thích các bước giải:
b)\(\sqrt{(2-\sqrt{5})^{2}}\)+\(\sqrt{(3-\sqrt{5})^{2}}\)=\(2-\sqrt{5}+3-\sqrt{5}=5-2.\sqrt{5}\)
c) \(Đề \Leftrightarrow\) \((\frac{\sqrt{x}(\sqrt{x}+2)}{\sqrt{x}(\sqrt{x}-2)}\)+\(\frac{\sqrt{x}}{\sqrt{x}-2}).\frac{1}{\sqrt{x}+1}\)=\(\frac{2\sqrt{x}+2}{(\sqrt{x}-2)(\sqrt{x}+1)}=\frac{2(\sqrt{x}+1)}{(\sqrt{x}-2)(\sqrt{x}+1)}=\frac{2}{\sqrt{x}-2}\)
