1问题的提出教学实践中教师常常会碰到很多不可思议的情况:学生课上例题一听就懂,课后题目一做就错;错题经过老师讲评学生订正后,但仍有学生继续错之;学生能得出正确答案,却不能给出正确的解释;学生只会模仿解题,创造性的解法缺失.教师对这些情况颇感头疼,有的老师是反复讲解,但却效果不明显. 1 questions put forward Teaching practice teachers often encounter a lot of incredible situation: a lesson in the class to understand, the subject after class to do wrong; wrong problem after the teacher comment on the students after the correction, but there are still students continue to make mistakes ; Students can get the correct answer, but can not give the correct explanation; students will only imitate problem solving, creative solution is lacking. Teachers are quite a headache in these situations; some teachers explain repeatedly, but the effect is not obvious.