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特值法是通过特殊值或特殊的情境来拓宽已知条件,这有助于寻求解题思路,降低解题难度,提高解题速度.特值法是学生解题重要利器,但在实际的教学中,学生做题总是想不到利用特殊值,没有使用特值的意识.由于特值法只要考虑最特殊的情形或取特值是否满足条件即可,有时学生既惊叹于特值法解题的快捷,又因为使用特值不当而产生错误,真是想说爱你不容易.本文结合教学实际,对特值法在解题教学中的作用进行探索,并对
The special value method is to broaden the known conditions through special values or special situations, which helps to find solutions to problems, to reduce the difficulty of solving problems and to improve the speed of solving problems.Exception value method is an important tool for students to solve problems, but in the actual Teaching, students always think of the problem can not use the special value, there is no use of special value of consciousness. As the special value method as long as the most special cases or take special values to meet the conditions can be, sometimes students marvel at the special value method to solve the problem Of the fast, but also because of the use of improper values and mistakes, I really want to say love is not easy.This paper combines teaching practice, the value of the law in the problem-solving teaching to explore, and