老徐是我的数学老师,讲课非常生动。在家乡的方言里,土里土气的人被说成是“仆佬”。当我们学到“因为符号”(两点在上,一点在下)和“所以符号”(一点在上,两点在下)的时候,他说:“其实这个很好记的,你们看,‘因为’像不像一个仆佬?”如此一说,还真是颇为相似:两个圆溜溜的眼睛,一个小小的嘴巴。当我们学到有理数的加减时,为了方便记忆, Xu is my math teacher, lectures very vivid. In the hometown dialect, rustic people are said to be “servants”. When we learned that “because of the sign ” (two points up, one point down) and “so the sign ” (one point up, two points down), he said: “Actually, You see, ’because’ it’s not like a servant? ’”To put it this way, it’s quite similar: two round eyes and a small mouth. When we learn addition and subtraction of rational numbers, in order to facilitate memory,