`1).``A=(x-\sqrt{x})/(x-9)+1/(\sqrt{x}+3)-1/(\sqrt{x}-3)`
`=(x-\sqrt{x})/((\sqrt{x}+3)(\sqrt{x}-3))+[(\sqrt{x}-3)-(\sqrt{x}+3)]/((\sqrt{x}+3)(\sqrt{x}-3))`
`=(x-\sqrt{x}+\sqrt{x}-3-\sqrt{x}-3)/[(\sqrt{x}+3)(\sqrt{x}-3)]`
`=(x-\sqrt{x}-6)/[(\sqrt{x}+3)(\sqrt{x}-3)]`
`=[(\sqrt{x}+2)(\sqrt{x}-3)]/[(\sqrt{x}+3)(\sqrt{x}-3)]`
`=(\sqrt{x}+2)/(\sqrt{x}-3)`
`2).``B=(1/(\sqrt{x}+2)+7/(x-4)):((\sqrt{x}-1)/(\sqrt{x}-2)-1)`
`=(1/(\sqrt{x}+2)+7/[(\sqrt{x}+2)(\sqrt{x}-2)]):(\sqrt{x}-1-\sqrt{x}+2)/(\sqrt{x}-2)`
`=(\sqrt{x}-2+7)/[(\sqrt{x}+2)(\sqrt{x}-2)].(\sqrt{x}-2)`
`=(\sqrt{x}+5)/(\sqrt{x}+2)`
