1 câu này thôi ạ , pleaseeeeeeeeee

`A=2/(\sqrt{3}-1)+\sqrt{12}:\sqrt{4}-2\sqrt{3}`

`=(2.(\sqrt{3}+1))/((\sqrt{3}-1).(\sqrt{3}+1))+\sqrt{12:4}-2\sqrt{3}`

`=(2.(\sqrt{3}+1))/((\sqrt{3})^2-1^2)+\sqrt{3}-2\sqrt{3}`

`=(2.(\sqrt{3}+1))/2-\sqrt{3}`

`=\sqrt{3}+1-\sqrt{3}`

`=1`