1. If the characters in the formula all appear in the same horizontal position, for example, y=ax2+bx+c, you can directly enter y=ax2+bx+c, and then select 2 and set it as superscript (you can drag the up and down buttons on the formatting toolbar) to set the letters as italics. The method is to select Y, click the italic button in the formatting toolbar, then double-click the formatting brush button in the common toolbar, then move the mouse pointer to ax, bx and C and set it to italic, and then click the formatting brush button or press Esc, thus setting up the formula. The operation method with the underlying label is similar. 2. For more complex mathematical formulas, you need to start mathtype. Mathtype is an independent program in Word, so you need to select it when installing Word, otherwise your machine may not be able to use mathtype. The solution is to reinstall Word (add mathtype). If you use mathtype frequently, you can set tool buttons on the toolbar. Click the button when you need to insert a mathematical formula. If you don't use mathtype frequently, use the Object command on the Insert menu and select Microsoft Equation2.0(Word6.0) or Microsoft Equation3.0(Word97) to open the formula window. You can input y =, select radical template, then select formula template, and input molecules sin2x-cos2x respectively. Then set two 2' s as superscript (using the upper and lower index templates), input the denominator loga, set A as subscript, and then use the fractional template to input, and this complex mathematical formula will be completed soon. If you want to change its size in a Word document, you can drag the control points on the four corners with the mouse to change the size. Mathtype's default variables are italics, function names and characters are orthography, and it also contains uppercase and lowercase Greek letters, common symbols, fence templates, etc. , the specific use can be understood. With continuous use, you will find that formula processing becomes easier.