1. First, switch the input method on the computer to "sogou Input Method". At this time, the interface of sogou input method will appear on the computer. Click the toolbox on the far right of the sogou input method interface.

2. Select "Complete Symbol" in the pop-up dialog box.

3. Select the "Mathematics/Unit" column on the left in the dialog box, and various operation symbols in mathematics will appear in the interface. Select the required operation symbol, and click OK to finish the input.