Question

Rút gọn biểu thức: 

(\(\dfrac{1}{\sqrt{x}-5}-\dfrac{1}{\sqrt{x}+5}\))\(:\dfrac{x+3}{x-25}\)

Answer 1

đk : x >= 0 ; x khác 25 ; -3 

\(\left(\dfrac{\sqrt{x}+5-\sqrt{x}+5}{x-25}\right):\dfrac{x+3}{x-25}=\dfrac{25}{x+3}\)