`Excel 2007`

, under `Formulas `

`Tab `

there is toggle button `Show Formulas`

to show or hide formulas in the Worksheet. The key board short cut is` CTRL + ``

and in Excel2003 it is under `Tools->Options->View->Formulas `

Check box.It is explained here

http://blog.contextures.com/archives/2009/03/23/show-excel-formulas-instead-of-results/[^]

I think it may be helpful.