“课标”指出:“让学生在生动具体的情境中,理解和认识数学。”为此,众多数学教师在设计新课时,把追求课堂的热闹当成了一种时尚,于是各种制作精美、画面逼真的课件纷纷在课堂中亮相。然而,由于对外在形式的过分推崇和对课堂生成把握的失度,不但未能收到预期的效果,反而使课堂出轨,学习偏向,令老师陷入尴尬的境地。 “Class standard ” pointed out: “so that students in a vivid and specific context, understanding and understanding of mathematics. ” Therefore, many mathematics teachers in the design of new courses, the pursuit of the liveliness of the classroom as a fashion, so each Exquisitely crafted, realistic picture courseware have appeared in the classroom. However, due to the exaggeration of extrinsic forms and the loss of confidence in the production of the classroom, not only failed to receive the expected results, but instead the classroom derailed and the learning bias turned the teacher into embarrassment.