当前中学数学教材份量重,习题量大,一些教师陷入题海战,这样,加重了学生的负担,收效甚微。这是当前数学教学中的一个突出问题,只有充分发挥教师的主导作用,才能很好解决这一问题。我通过一个例题的教学体会到:深钻教材,挖掘教材中知识之间、习题之间、例题与习题之间的有机联系。精讲精练,一题多变,能获得较好的效果。现行初中数学课本《代数》第四册P_(53)例4,安排在解直角三角形的应用里。当学习了解斜三角形之后,我们又在解斜三角形的应用里安排了这个例题,使它又有新的解法。而且我们通过这个图 The current high school mathematics textbooks are heavy and the volume of exercises is high. Some teachers are caught in a sea battle. This increases the burden on students and has little effect. This is a prominent problem in current mathematics teaching. Only by giving full play to the leading role of teachers can we solve this problem very well. I learned through an example of teaching: deep drilling materials, mining the knowledge of the materials, exercises, examples and exercises between the organic links. Refined scouring, a change of subject matter, can get better results. The current junior middle school mathematics textbook “Algebra”, Volume 4, P_(53), Case 4, was arranged in the application of solving the right triangle. After learning to understand oblique triangles, we have arranged this example in the application of skewed triangles, so that it has a new solution. And we pass this figure