设计“开放式”练习题,鼓励学生用自己的思维方式解决问题,这是教师实施“开放式”习题教学的基础。例如有这样一道开放题:购进的苹果比鸭梨少45(补充不同的条件和问题,编成不同的分数应用题,再解答)。从题目的编排用意看,主要是让学生进一步认识较复杂的分数乘除法应用题的特 Designing “open” exercises to encourage students to solve their problems in their own way of thinking is the foundation for teachers to implement “open” exercises. For example, there is such an open question: purchase of apples than pear less 45 (supplement different conditions and problems, compiled into different score application questions, and then answer). The purpose of the arrangement from the point of view, mainly to enable students to further understand the more complex fractional multiplication and division of application problems