1. Part of the formula law, sort out the main points of learning, analyze the internal laws, show the ideas of solving problems, and help primary school students accumulate at all times.
2. The full-color version is almost the same as the full-color version, which is written in combination with the practice of mathematics teaching in the implementation of the new curriculum standard. There is little analysis of the formula law and the content is not detailed enough, so some versions are better.