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从上学期开始,我们注意了在课内指导学生练习,以提高学生的解题能力。经过不断的摸索,我们觉得以下几种形式,比较有效。一、在讲授新知识时,组织学生练习有关的学过的知识。例如讲解无理方程的解法以前,先让学生练习列方程解应用题的知识,解“一矩形的周长及和它等积的正方形的周长共为54厘米,已知矩形相邻两边之长相差9厘米,求矩形的长和宽”这个题目,要求他们细心审题,设定未知数,指出已知量和未知量的关系,列出方程,逐步整理而得出x+(x(x+9))~(1/2)=9,由此即引出无理方程的概念。
From the beginning of the semester, we have taken note of guiding students to practice in class so as to enhance their ability to solve problems. After continuous exploration, we think the following forms, more effective. First, when teaching new knowledge, organize students to practice the learned knowledge. For example, to explain the solution of the unreasonable equation Previously, let students practice knowledge of column equations to solve the application problem, the solution “a rectangular perimeter and its equilateral product of the total circumference of 54 cm, the known length of the adjacent sides of the rectangle The difference of 9 centimeters, seeking rectangular length and width, ”the subject, asked them to carefully examines the problem, set the unknown, pointed out that the relationship between the known amount and the unknown amount, list the equation, and gradually finishing and draw x + (x ) ~ (1/2) = 9, which leads to the concept of unreasonable equation.