Using Excel 2003.

I want all the data in a row to take a specific formula, say = X * 3. But
the value of X varies for each of the cell. How do I do so without having to
type in the same formula for each cell?

Furthermore I want the value of X for each cell to be seen. Thus I don't
want to enter all X in row 1 , and in row 2 enter =A1*3. Then copy & paste
the formula onto the entire row. Because by doing this, people can't tell
what is A1, B1,....

Thank you.