东江老师能把自己不成功的课例发表出来，这既是明智之举，也是一种有识之作，同时也足见编辑为中学数学教学服务的良苦用心．这节思维训练课确实有“尚未成功”之处，原因在哪里呢？东江老师自己清醒地意识到有四点（参见原文）．从表面上看，这四点确是“尚未成功”的原... It is both a sensible move and an insightful work that Dongjiang teacher can publish his unsuccessful lesson examples. At the same time, it also shows the good intentions of the editors in the service of mathematics teaching in middle school. This section of the thinking training class does have “unsuccessful place.” Where is the reason? Dongjiang teacher clearly realized that there are four points (see text). On the surface, these four points are indeed the original “unsuccessful”...