Step 1th, open the Word2010 document window, click the formula you want to add the negation operator to so that it is edited, and position the insertion cursor in the target location, as shown in Figure 1.
Figure 1 Click the formula you want to add the negation operator to
Step 2nd, click the other button in the symbol group in the formula Tools/design ribbon to open the symbol panel, and then click the Drop-down triangle button at the top. Select the "Reverse relational operator" option in the Open Drop-down menu and select the desired negation operator in the open negation operator panel, as shown in Figure 2.
Figure 2 Selecting the Add negation operator