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在解决有关水库大坝问题时,总有很多学生被杂乱的高线搞晕.经过老师讲解,当场明白,一段时间之后,又回复如初.究其原因,教师没能从根本上消除学生的迷惑.那么,怎样才能拨开云雾,还学生一片晴空呢?笔者经过研究发现,“高”病还需“高”来医.只需要一点点改变,效果截然不同.现以两道习题为例,体会改变后的作用。例题1为了加固防洪设施,沿一座水库大坝的背水坡,将坝顶加宽2米,坡度由原来的1:2改为1:2.5.已知大坝高6米,求加宽部分的横断面AFED的
In solving the reservoir dam problems, there are always a lot of students are messy high line to do dizzy .After the teacher explained that on the spot understand, after a period of time, and reply as early as possible.The reason, the teacher failed to fundamentally eliminate the confusion of students So, how can we get rid of the clouds, but also the students a clear sky? The author after study found that “high” disease also need “high ” to the doctor only need a little change, the effect is very different. Exercises, for example, experience the changed role. Example 1 In order to reinforce the flood control facilities, along the back slope of a reservoir dam, the crest should be widened by 2 meters and the slope should be changed from 1: 2 to 1: 2.5. The dam is known to be 6 meters high, Cross section AFED