Very good. Teacher Wei Hua, the person in charge of preparing for the third year of the seventh middle school tree-lined campus. On the basis of assisting the teaching of excellent courses, Mr. Wei shared his understanding of the national finale of Chengdu No.7 Middle School and the corresponding teaching strategies with all the teachers. He introduced the background of the topic-beyond the limit scale technology of structural algebra-in a simple way by digging and analyzing the national second volume 2 1 in 20 14 years, and described it in humorous language. In the process of explanation, Mr. Wei takes improving the accuracy of the estimated value of ln2 as the driving force of teaching presentation, from easy to difficult, from constants to parameters, step by step, combining numbers with shapes, and combining functions, equations and inequalities to present a view of big algebra; From the construction of the basic estimation formula, to the compactness of the estimation formula, and then to the adjustment of the estimation formula with participation rights, the formation process of the finale problem is presented step by step, and the corresponding cracking strategies are given.

Teacher Wei digs deep into the essence of problems, presents the essence of mathematics, jumps out of the sea of questions for students, improves mathematical thinking, and points out a way to return to the source for senior three review. The teachers attending the meeting sincerely praised Mr. Wei for his in-depth research, and everyone benefited a lot from the understanding and analysis of the finale!