Open word, place the mouse at the position where you want to insert the matrix, and click Insert-Formula to enter the formula editor interface as shown in the following figure:

2. Find the bracket to be inserted outside the matrix: directly click the image frame to be inserted into the matrix at the upper left of the edit box.

3. Click the location below to open the Matrix dialog box.

4. In the dialog box, enter the required number of columns, as shown.

5. Sometimes work needs to change the adjustment of the matrix? draw

After editing the matrix, select "Update to Document" under the "File" menu, and the matrix will be written in Word. The method of inserting matrix in PPT is similar to that in Word, so you can refer to the above steps.