在教学实践中,由于日常工作的繁忙、职业的倦怠、经验的狭隘等原因,导致许多教师为了省事,课堂教学的设计常照搬教案书籍上的现成设计,很少结合实际独立设计;习题的教学,特别是疑难问题的教学常依赖参考答案,很少自主探究。对教材、问题的理解 In teaching practice, due to the busy day-to-day work, job burnout, the narrow experience and other reasons, many teachers in order to save trouble, classroom design often copy the off-the-shelf design books, rarely with the actual design; exercise teaching , Especially teaching difficult questions often rely on reference answers, rarely self-exploration. The textbook, understanding of the problem