The method is as follows:
1. Open the Word document and click Insert → Text → Object.
2. Drag the slider in the "Object" column to find "Microsoft Formula 3.0" and press "OK".
3. At this time, the formula editor will pop up for the user to fill in the formula.
The above is the location of the word formula editor introduced by Bian Xiao. Users who don't know how to use word Formula Editor may wish to try the above steps.