Classic gray symbol background educational PPT template

This is a classic mathematic symbol for the background picture of the PowerPoint template, the entire template to gray as the background color, with the art after the division as the PPT background picture. Suitable for the production of educational teaching slides, especially for the production of math courseware PPT;

This is a classic mathematic symbol for the background picture of the PowerPoint template, the entire template to gray as the background color, with the art after the division as the PPT background picture. Suitable for the production of educational teaching slides, especially for the production of math courseware PPT;