The middle point of Shenzhen's third grade math brush exercise book. According to relevant public information, the editors-in-chief of Dot Workbook are all proud. All the topics in the whole compilation are in-depth from the beginning. Multiple-choice questions and fill-in-the-blank questions, including the following solutions, are gradually deepening, and we must think deeply before we can have ideas. The question type is still relatively novel. Many questions are collected and selected from the national middle school entrance examination questions. The types of exercises are comprehensive. The method to solve the problem is novel and unique. Especially suitable for students above technical secondary school. It is the best material for students to learn mathematics.