教育家苏霍姆林斯基曾经说过 :“有意义的情境创设 ,是他们（指学生）始终以积极态度参与的无形动力。”这说明学生学习的主动性与学习情境密切相关。因此 ,在数学教学中 ,要注意创设具体生动的教学情境 ,使学生最大限度地处于主体激活状态 ,主动积极地动眼、动耳、动口、动脑 The educator Sukhomlinski once said: “The creation of meaningful situations is an intangible motivation for them (the students) to always participate with a positive attitude.” This shows that the initiative of student learning is closely related to the learning situation. Therefore, in mathematics teaching, we should pay attention to the creation of specific and vivid teaching situations so that the students are in the state of the subject’s activation to the maximum, actively moving the eyes, moving ears, moving mouth and brains.