First, bring up the formula editor of Word. The steps are as follows:

1. Click the Tools menu in Word, and then select Customize.

2. Select Insert under the Commands tab.

3. Find the "Formula Editor" on the right, that is, the option with the root number A, press and hold it with the left mouse button, and drag it directly to the word toolbar. Let go in the toolbar position, and an icon will be generated, which is the icon of the formula editor.

Secondly, when you need to use the formula in the future, click this "root A icon" to directly enter the formula editing state. At this time, choose the formula type you want to write, and then enter the code or numerical value in the corresponding place.

Step 3: After the formula editing (input) is finished, close the formula editing window.