Question

giải giúp mk câu o vs ạ

Answer 1

\(=\left(\dfrac{2-\sqrt{3}+1}{2}\right):\left(\dfrac{\sqrt{3}-1+4}{2}\right)=\left(\dfrac{3-\sqrt{3}}{2}\right):\left(\dfrac{3+\sqrt{3}}{2}\right)\)

\(=\dfrac{3-\sqrt{3}}{3+\sqrt{3}}=\dfrac{\left(3-\sqrt{3}\right)^2}{\left(3+\sqrt{3}\right)\left(3-\sqrt{3}\right)}=\dfrac{12-6\sqrt{3}}{6}=2-\sqrt{3}\)

Answer 2

\(\left(1-\dfrac{\sqrt{3}-1}{2}\right):\left(\dfrac{\sqrt{3}-1}{2}+2\right)\)

\(=\dfrac{3-\sqrt{3}}{2}:\dfrac{\sqrt{3}-3}{2}\)

=-1