我国的一位学者有一次到国外去考察,听了一堂洋教师的分数加法课.在课堂上,老师首先提问学生21+13等于多少?不一会儿,许多学生纷纷站起来回答:12+31=25.然后,老师又问其余的学生,你们有不同意见吗?其余学生都说没有.这时老师便说:“那好!就让21+13等于52吧!这就是分数的加法,… A Chinese scholar once went abroad to study and listened to a foreign teacher’s grade addition class.In the classroom, the teacher first asked students how much the same as 21 +13? A moment later, many students got up and answered: 12 + 31 = 25. Then, the teacher asked the rest of the students, do you have different opinions? The rest of the students say no. Then the teacher said: "Well! Let 21 +13 equal to 52! This is the addition of scores, ...