[案例]“设计容积最大的纸盒”教学片段教学活动课上,教师出示了这样一道题:用一张长40厘米,宽2喱米的长方形硬纸板,做一只深5厘米的长方体无盖纸盒,这个纸盒的容积最大可能是多少? 师:下面的程序是先设计,再汇报,最后制作。 (学生兴致勃勃地在纸板上画起来,不到2 [Case] ​​“Design the largest carton” teaching fragment Teaching activities class, the teacher showed such a question: with a rectangular 40 cm long and 2 cm thick rectangular cardboard, make a 5 cm deep rectangular no Cover the carton, the maximum volume of this carton may be? Teacher: The following program is the first design, and then report, the final production. (Students painted on cardboard less than two