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在现行高中立体几何课本中(刘牧等编,人民教育出版社)有一个习题,(课本第128页习题十一第9题)的内容,我觉得有提出商榷的必要,现在把我肤浅的意见,叙述如次,备供大家参考。并希指正!
In the current high school solid geometry textbooks (Liu Mu et al., People’s Education Press), there is an exercise in the content of the (question 11 on the 128th of the textbook). I feel that there is a need for discussion and I am now superficial. Opinions and narratives are provided for your reference. And he is pointing!