怎样引导学生将优化算法落到实处呢?“9+几”教学中的小案例引发了我们的思考。一、案例回放:“口服心不服”“9加几”的教学中,教师首先让学生观察主题图,根据发现的数学信息,说一说可以提出哪些数学问 How to guide students to optimize the algorithm come true? “9+ few ” teaching a small case triggered our thinking. First, the case playback: “oral refuses to accept ” “9 plus a few ” teaching, the teacher first let the students observe the subject map, according to the mathematical information found, to say what math problems can be asked