Take word20 16 as an example, and the specific methods are as follows:

1. Create a new word document, open it, and then click Insert.

2. Click the formula;

3. Then click Insert New Formula;

4. Then click the drop-down option;

5. In the pop-up page, click the small inverted triangle in the upper right corner and select handwriting;

6. Find the handwriting of "X" and click Enter;

7, as shown below.