Question

[Nguyễn Trần Phương Thảo]

rút gọn biểu thức:

A=\(\left(\frac{\sqrt{x}-2}{x-1}-\frac{\sqrt{x}+2}{x+2\sqrt{2}+1}\right).\frac{\left(1-x\right)^2}{2}\)

ai trả lời đúng yêu lun ý!!!

Answer 1

[Nguyễn Lê Phước Thịnh]

\(A=\dfrac{\left(\sqrt{x}-2\right)\left(\sqrt{x}+1\right)-\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+1\right)^2\cdot\left(\sqrt{x}-1\right)}\cdot\dfrac{\left(x-1\right)^2}{2}\)

\(=\dfrac{x-\sqrt{x}-2-x-\sqrt{x}+2}{1}\cdot\dfrac{\sqrt{x}-1}{2}=-\sqrt{x}\left(\sqrt{x}-1\right)\)