The problem of chartering a boat is the teaching content of the last example of Unit 1 in the next semester of Grade Four in the new textbook. According to the analysis of teaching staff, the purpose of chartered teaching is to infiltrate optimization ideas into students.

What is optimization thought? In the book Primary School Mathematics and Mathematical Thinking Methods, Wang Yongchun's understanding of optimization thought is to choose the optimal solution among the diversity of problem-solving strategies. As far as this topic is concerned, I think the optimization thought should be embodied in two aspects: one is the optimization thought carried by the meaning of the topic itself. That is, in the charter scheme, choose the best scheme that saves the most money. The second optimization idea should be an optimization idea that should be infiltrated in the process of solving problems. What do you mean? In the process of solving this problem, our solutions are also varied. Which solution is more difficult for students to understand and which scheme is more intuitive for students to operate? It is also the embodiment of optimization idea to choose one scheme among various schemes.