一堂失败的公开课让我体会到了:有效的呈现和正确的引导直接关系到课堂的成败。在没有多媒体的动态生成辅助下,我们更要注意各种活动的呈现、板书的呈现。而正确的引导,更是有效课堂的关键。它为学生探寻数学的真理指明了方向,只有正确的方向,才能让学生成功地找到解决问题的钥匙。在新课程下标准下的教学,越来越注重多媒体的运用。特别是公开课中,几乎已经离不开多媒体。多媒体的作用 A failure of the open class made me realize: effective presentation and correct guidance directly related to the success or failure of the classroom. Without the aid of dynamic generation of multimedia, we should pay more attention to the presentation of various activities and the presentation of blackboard. The correct guidance is the key to effective classroom. It points the way for students to explore the truth of mathematics, and only in the right direction can students be successful in finding the key to solving the problem. In the new curriculum under the standard of teaching, more and more emphasis on the use of multimedia. Especially in open class, almost can not do without multimedia. The role of multimedia