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在東北人民政府教育部編譯的初級中學教科書“平面幾何”中,§101舉了一個四边形的作图题,§102最末附問一個撞台球的問題。這兩題在劉薰宇編的初級中學課本“平面幾何”中,後者列為習題二九的第20題,前者作為§140的例2.前者在兩书中都僅有解法而無討論,後者在本通報1953年5月號“數學问题及解答欄”中(第27題)亦僅有解法而無討論。關於它們應如何討論,屢有讀者來函詢問,今筆者承編者同志的
In the “planar geometry” of the textbook for junior high schools compiled by the Ministry of Education of the Northeast People’s Government, §101 presents a quadrilateral drawing question, and §102 entails the question of playing billiards. These two questions are listed in the “plane geometry” of the junior middle school textbook compiled by Liu Xunyu. The latter is listed as the 20th problem in Exercise 29, the former being the case of §140. The former has only the solution in the two books but no discussion, and the latter is This Bulletin, May 27, 1953, in the “Mathematics Questions and Answers” section (Item 27), has only solution but no discussion. Regarding how they should be discussed, the readers have been repeatedly asked to enquire.