上当题不一定是难题,但学生经常出错。原来,它是命题人在彻底熟悉了教材和充分洞察了学生在认知上的弱点后,而故意给题目设置一些容易“混淆视听”的成分,容易使学生上当而出错。下面我们来看几例: 例1.如图1所示,静止的倾斜传送带上,有一木块由顶端匀速下滑到底端所用的时间为t_0;当传送带向上开动时,木块由顶端滑到底端所用时间为t,则 It is not necessarily a difficult problem, but students often make mistakes. Originally, it was the proposition person who, after thoroughly familiarizing with the teaching materials and gaining full insight into the students’ cognitive weaknesses, deliberately provided some easy-to-obfuscate elements to the subject, which made it easy for the students to be fooled and made mistakes. Let’s take a look at a few examples: Example 1. As shown in Fig. 1, on a stationary tilting conveyor belt, there is a time when the wooden block slides uniformly from the top to the bottom end. The time taken is t_0; when the conveyor belt moves upwards, the block slides from the top end to the bottom end. The time used is t, then