The image shows a page from a textbook or educational material. The text on the page appears to be in Chinese, and it seems to be discussing a topic related to mathematics or science. The page contains several sections of text, including headings and subheadings, which suggest that it is part of a larger document. The layout includes a mix of bold and regular text, with some sections highlighted in red, possibly indicating important or highlighted information. The overall design suggests that this is an academic or educational resource.