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1、相似三角形的性质教学片断165（Teaching fragments of the properties of similar triangles 165）How to learn to learn to read for the Li - Ou YangxiuLesson preparation analysisI. Analysis of teaching materials:1, the status and role of teaching materials:In this section, we further study the properties of similar tri
2、angles on the basis of the definition and judgement of similar trianglesIn this section, the ratio of the corresponding triangle, the ratio of the corresponding line and the ratio of the corresponding bisector are equal to those of the similarity ratio. This section plays a connecting role in the wh
3、ole geometry research2, teaching key points and difficultiesThe forming process of the property theorem of similar trianglesTwo, target analysis:According to the requirements of the teaching outline of junior high school mathematics and the structural features of the teaching content, according to t
4、he requirements of quality education, and combining with the actual level of students, the teaching objective of this lesson is as follows:1, knowledge and skill goal: grasp the ratio of the corresponding triangle triangle, the ratio of the corresponding bisector and the ratio of the corresponding l
5、ine is equal to the nature of similarity ratio, and can use these properties to solve some simple problems2, process and method goal: through the similar triangle nature, the theorem and the application explanation, raises the student to induce the thought and the special to the general understandin
6、g rule, expands the student thoughtAt the same time, it can train students analytical ability, inquiry ability, inductive ability and expression ability3, emotional and attitudinal objectives: students through experience, ask questions, verify questions and conjecture, proof and other methods, exper
7、ience the joy of cooperation, improve students interest in learningTeaching emphasis: the deduction of the corresponding line segments in similar triangles and the application of the properties of similar triangles to solve practical problemsTeaching difficulties: the use of similar trianglesTwo, te
8、aching methods:1, design problem situationAccording to the teaching objectives of this lesson, teachers create problems and guide students to analyze and think2, discussion teachingLet the students discuss, exchange and summarize in groups. The members of the group represent the group and express th
9、eir opinions (the teacher gives the evaluation), and tell the nature of the similar triangles, and the teacher will affirm and appraise the students opinions in a timely manner3, stratified teachingThe questions should be stratified, layered and stratified. Attention should be paid to the students w
10、ho are facing the students, so as to arouse the enthusiasm of the students at different levels4, guide students in group discussions and exchanges, promote the formation of the construction of mathematical thought and method of student knowledge, attention for all students, training students to expl
11、ore, thinking spirit, improve the ability of students cooperative learning and communication of MathematicsIn the classroom teaching, exercises have a certain potential effect. It plays an important role in helping students understand the basic concepts, consolidate and strengthen the memory, and cu
12、ltivate and develop their thinking ability,Analysis of three students, |Students have different levels of mathematical basis, so that students can maximize their own levelTeaching details28.5 properties of similar triangles (1)Songjiang No.2 (Group) junior middle school Ding YuTeaching target:1, kno
13、wledge and skill goal: grasp the ratio of the corresponding triangle triangle, the ratio of the corresponding bisector and the ratio of the corresponding line is equal to the nature of similarity ratio, and can use these properties to solve some simple problems2, process and method goal: through the
14、 similar triangle nature, the theorem and the application explanation, raises students analysis ability, the induction ability and the expression ability and so on3, emotional and attitudinal objectives: students through the conjecture, proof and other methods to experience the joy of cooperation, i
15、mprove students interest in learningTeaching emphasis: the ratio of the corresponding height in the similar triangle, the ratio of the corresponding bisector of the corresponding line and the ratio of the corresponding central line are equal to the similarity ratio, and the nature of the similar tri
16、angle is used to solve the practical problemTeaching difficulties: the use of similar trianglesTeaching methods: inspiration and combination of speaking and trainingThe teaching processFirst, review questions:Question 1: the definition of similar triangles? What is similarity ratio?Question 2: two similar triangles, in addition to
