You can insert a new formula to add a horizontal line above the letters.
1. Take the Word2010 version as an example, as shown below. After opening the document, click "Insert" at the top of the page;
2. In the Insert menu bar Next, click "Formula";
3. Select "Insert New Formula" in the pop-up box;
4. Click "Derivative Symbol" at the top of the pop-up page and select the horizontal bar symbol in the pop-up box;
5. As shown below, you can select the horizontal bar symbol in the horizontal bar box Enter the letters in.
For more word-related technical knowledge, please visit the Word Getting Started Tutorial column to learn!
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