从心理过程来讲,思维方向有两个序列:正向思维序列和逆向思维序列.在教学中,正向思维容易培养和形成,也容易被人们所注意.正向思维往往带有模拟性质,学生的解题往往只能把原来的知识再现,因此是一种再造性思维而不是创造性思维.例如:在集合这个单元教学中,我在讲完并集之后出过这样一个练习题:已知集合A= From the psychological process, the direction of thinking has two sequences: positive thinking sequence and reverse thinking sequence. In teaching, positive thinking is easy to cultivate and form, and it is also easily noticed by people. Positive thinking often has analog properties. Students’ problem solving often only reproduces the original knowledge, so it is a kind of recreative thinking rather than creative thinking. For example, in the united teaching of this unit, I have done such an exercise after the completion of the union: Known Collection A=