1. First select the Word document and double-click it to open it.
2. Then in this interface, click the "Insert" option in the toolbar.
3. Secondly, in this interface, click the Formula button in the toolbar.
4. Then in this interface, click the "bracket" button in the toolbar.
5. Secondly, in this interface, click the "brace" option in "square brackets".
6. Finally, the results are successfully displayed in the interface.