1. Open excel20 10 and click the "Insert" function.

2. Select "Formula" in the upper right corner.

3. We can see many formulas, taking the area formula of a circle as an example.

4, insert the corresponding position.

5. If there is no required formula in the built-in formula, you need to click Insert-Formula.

6. You can see the formula edit box.

7. Click "Settings"

8. Prepare the formula as required.