The problem should be Figure 4 in Appendix 1. There will be an attached page sign at the end of the third grade math textbook, in the upper left corner of the book. If Zhao has an attached page, you can look forward from the last page of this book. You can find the picture after you find the logo with the attached page 1. You can look for the logo in Figure 4 at the bottom of the picture. After finding it, the corresponding picture is the picture attached to the first page. Attached pages generally indicate that an item in the text cannot be filled in the text. You can attach one or more pages to the back of the text as a supplement or detailed record. Attached pages are generally marked with the answers of each page, which are set after the last paragraph and can be found at the back of the book.