我们偶然得知,在某小学三年级的数学考试中,应用题的得分率最低,教师认为这主要是学生“粗心的计算错误”造成的,在察看了几份答卷后,我们发现一种可以名之为“实际上不可能答数”的错误。例如在行程问题上,有的答数表示飞机总共飞了(-X)公里;在工程问题上,筑路的公里数也出现负数;有的答数表示飞机的时速或在3公里 We have occasionally learned that in the third grade math exams of a certain elementary school, the scores of applied questions are the lowest. Teachers think this is mainly caused by the students' “careless calculation errors.” After examining several questionnaires, we found that one can Name it “actually impossible to answer” mistake. For example, on the itinerary, some of the answers indicate that the aircraft flew a total of (-X) kilometers; on engineering problems, the number of kilometers of road construction also showed a negative number; and some answers indicated that the aircraft's speed was at 3 km