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How to type the expressions commonly used in mathematics in word: add an apostrophe to the upper right corner of a letter?
There are two methods, as follows:

One,

1. Open word, click Insert in the toolbar above word, and then select Symbol-Other Symbols.

2. The symbol dialog box will pop up. Select the symbol as shown in the figure to enter.

Second,

1. Select the system input method and switch the input method to English mode.

2. Click the second key on the left of "L" to enter.