【案例背景】新一套数学义务教育教科书已经全面走进我们的数学课堂,在使用和探索中,老师们感受到新教材的风格和特色更加鲜明,结构更为科学合理。但同时也给老师们带来了困惑,在平时学校的教学研讨中,总会听到:“新教材很不好教:课本习题难度大、类型单一、计算数字偏大、学生不愿意算……”诸如此类的埋怨声、诉苦声。如何使用新教材,才能使教者轻松、学者愉快呢?前段时间,从城区到我们学校置换的钟老师给我们展示了《工程问题》的 Case Background A new set of textbooks for compulsory education in mathematics has been fully introduced into our math classroom. During their use and exploration, teachers feel the style and features of the new text are clearer and the structure is more scientific and reasonable. But at the same time it also brought confusion to the teachers. In normal school teaching discussions, they always hear: “The new textbooks are not very good for teaching: textbook exercises are difficult, the type is single, the calculation is too large, and the students are not willing to count ...... ”And so on the grumble, complained bitter sound. How to use the new teaching materials so that the teachers can be relaxed and the scholars happy? Sometime ago, Teacher Chung, who replaced us from the city to our school, showed us “engineering problems”