Question

[Pham Trong Bach]

Rút gọn biểu thức: $\mathrm{C}=\left(\frac{\sqrt{\mathrm{a}}+1}{\sqrt{\mathrm{ab}}+1}+\frac{\sqrt{\mathrm{ab}}+\sqrt{\mathrm{a}}}{\sqrt{\mathrm{ab}}-1}-1\right)$ $:\left(\frac{\sqrt{\mathrm{a}}+1}{\sqrt{\mathrm{ab}}+1}-\frac{\sqrt{\mathrm{ab}}+\sqrt{\mathrm{a}}}{\sqrt{\mathrm{ab}}-1}+1\right)$ ta được:

A. C = 2 $\sqrt{\mathrm{ab}}$ 

B. C = −2 $\sqrt{\mathrm{ab}}$

C. C = − $\sqrt{\mathrm{ab}}$

D. C =  $\sqrt{\mathrm{ab}}$

Answer 1

[Cao Minh Tâm]