Actually, it's not just the definition of a triangle. Many individuals think it is necessary to define it strictly, such as exchange method, association method, distribution method and so on. The textbook of Beijing Normal University is not written in place.

Will compiling textbooks like this bring confusion to teachers' teaching and students' learning?

Although I personally think that Beijing Normal University Edition is actually good in guiding the discovery of laws, I personally think that the content arrangement after guiding children to think is still relatively lacking. After guiding children to think, there should be a conclusion that mathematical language needs accurate description, rather than giving teachers an accurate description of mathematical language directly or giving mathematical concepts vague.

Therefore, in this revision process, the revision group of new mathematics curriculum standards focuses on the core literacy of mathematics. The overall performance of mathematics core literacy is "three skills": observing the real world from the perspective of mathematics (mathematical abstraction) (generality of mathematics).

Will use mathematical thinking to think about the real world (logical reasoning) (mathematical rigor). Able to express the real world (mathematical model) (universality of application) in mathematical language.

In addition to emphasizing core literacy, the revised version of the new curriculum standard has also been adjusted in terms of hours. The original two hours in primary schools have been adjusted to three hours: the first hour (1~2 grade), the second hour (3~4 grade) and the third hour (5~6 grade).

In terms of specific content, the revised version of the new curriculum standard moved negative numbers, equations and inverse ratios to junior high schools, which caused a lot of discussion in the industry.

Don't teach equations in primary schools in the future? It can be said that a stone stirs up a thousand waves. Will arithmetic be popular again? Aren't there many people criticizing Leo's arithmetic method?

To this end, I carefully studied Professor Shi Ningzhong's PPT, the leader of the revision group of the new mathematics curriculum standard, and found the part where the primary school did not talk about equations. The reason may be quite different from the understanding of the general public.