Rút gọn

$$\begin{gathered} Rútgọn: \\ J=(\frac{\sqrt{x}+1}{\sqrt{x}-1}-\frac{\sqrt{x}-1}{\sqrt{x}+1}):\left(1-\frac{\sqrt{x}-1}{\sqrt{x}+1}\right) \end{gathered}$$

$K=\left(\frac{\sqrt{x}}{\sqrt{x}-1}-\frac{1}{x-\sqrt{x}}\right):\left(\frac{1}{1+\sqrt{x}}+\frac{2}{x-1}\right)$
$L=\left(\frac{\sqrt{a}-2}{a-1}-\frac{\sqrt{a}+2}{a+2\sqrt{a}+1}\right).\left(1+\frac{1}{\sqrt{a}}\right)$
$Giúp mk với nhé xin cảm ơn nhiều ạ.Mk hứa sẽ tick cho.$