giải giúp mình bài này với mọi người mình cảm ơn

`a)1/(\sqrt(7)-\sqrt(6))=(\sqrt(7)+\sqrt(6))/((\sqrt(7)-\sqrt(6))(\sqrt(7)+\sqrt(6)))=\sqrt(7)+\sqrt(6)`

`b)2/(\sqrt(5)+\sqrt(3))=(2(\sqrt(5)-\sqrt(3)))/((\sqrt(5)+\sqrt(3))(\sqrt(5)-\sqrt(3)))=(2(\sqrt(5)-\sqrt(3)))/2=\sqrt(5)-\sqrt(3)`

`c)1/(2-\sqrt(5))=(2+\sqrt(5))/((2-\sqrt(5))(2+\sqrt(5)))=-2-\sqrt(5)`

`d)5/(3\sqrt(2)-2\sqrt(2))=(5(3\sqrt(2)+2\sqrt(2)))/((3\sqrt(2)-2\sqrt(2))(3\sqrt(2)+2\sqrt(2)))=(3\sqrt(2)+2\sqrt(2))/2`