MS Excel
You can edit a cell by

Selecting Edit > Edit cell from the menu
Double clicking the cell to edit it in place
None of these
Clicking the formula button

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MS Excel
To create a formula, you first:

Type the equals sign (=) to tell Excel that you’re about to enter a formula
Enter the formula using any input values and the appropriate mathematical operators that make up your formula
Select the cell you want to place the formula into
Choose the new command from the file menu

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