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You can use the formula bar in Excel to input several variables and obtain the output in a different cell. Here's an example:
Suppose you have three variables in cells A1, A2, and A3, and you want to calculate their sum and display the result in cell A4. You can use the following formula in the formula bar:
=SUM(A1:A3)
This formula adds the values in the range A1:A3 and displays the result in cell A4. You can change the values in cells A1, A2, and A3, and the result in cell A4 will automatically update.