Selecting the default installation when installing office will not install microsoft equation 3.0. When you customize the installation, select this feature in the offcie tool. If you don't want to bother, choose a safe installation. If symbols cannot be displayed, mathematical symbols in word documents are always displayed as small boxes. Double-click the mathematical formula that shows the problem, and the formula editor will start automatically. Click Style-Definition in the Formula Editor interface, and click Advanced in the pop-up Define Style dialog box. At this time, you can see the font settings of the formula editor, paying special attention to the settings of variables, lowercase Greek letters and symbols. If your system does not support this font, the formula editor will not be able to display mathematical formulas correctly. You can select the font you like and install in your system in the corresponding drop-down list box, so that it can be displayed correctly after setting and entering the formula. It is suggested to use "Times New Roman" font for variables and "Symbol" font for lowercase Greek letters and symbols. General windows systems install these two fonts by default. If your system doesn't have this body, search the font file symbol.ttf on the Internet, download it and put it in the C:/Windows/Fonts font folder, and everything will be fine. If you can't find the download of symbol.ttf from the Internet, you can try this method, that is, directly modify the existing font of this machine. The method is to open the formula editor in the Word document, then find the style in the menu bar in the upper left corner, and then select the definition. Then the Chinese font is Song Ti, and others, including Greek letters, choose "Times New Roman", which is our most commonly used font. The problem is solved! If what you see in Word is garbled, but what you see after entering the formula editor is the correctly displayed formula, then it will become garbled after exiting the formula editor. In fact, this is because the formula is automatically displayed in the formula editor in the font supported by your system, but it is not updated in the word document. At this time, you just need to click "File-Update Document …