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第四册教材中“两步计算的应用题”例1是加、减混合应用题,是学生学习两步计算的应用题的开始。从解答一步应用题到解答两步应用题,不仅是学生思维发展的转折点,也是解答多步复合应用题的基础和关键。教学的关键是指导学生根据题里的已知条件和所求问题恰当地提出中间问题。为了让学生过好这一关,
The fourth volume of teaching materials “two-step calculation of application problems” Example 1 is plus, minus mixed application questions, students learn the two-step calculation of the application of the beginning. From answering one-step application questions to answering two-step application questions is not only a turning point in the development of students' thinking, but also the basis and key for answering multi-step composite application questions. The key to teaching is to instruct students to properly raise intermediate questions based on the known conditions and questions asked. In order to allow students to better this off,