操作是学生理解知识、探究规律、解决问题的重要手段,是数学学习的重要方式之一,能有效促进学生探究能力与动手能力的提升“。下水操作”是指教师在课前对要求学生课中完成的操作活动预先进行模拟操作,以期从中发现学生可能会在操作时遇到的困难与问题,进而对学生操作活动进行有效的预设与调整,其本质即是对学生操作活动的备课。 Operation is an important means for students to understand knowledge, explore laws and solve problems. It is one of the important ways of learning mathematics, which can effectively promote students’ exploring ability and practical ability. “Launching operation” refers to the teacher’s requirement before class The operation activities completed in the student class are simulated in advance in order to find out the difficulties and problems the students may encounter during the operation and then to effectively preset and adjust the student operation activities. Lesson preparation