北大附中张思明老师曾设计了“打包问题”的教学案例 .这里“打包问题”指的是 :诸如若干个香烟盒等长方体物品 ,按照“打包时要求包内的相邻两物体必须全等的两个侧面来对接 ,且打包后仍是长方体”这一要求 ,将这些小长方体打成一大包 (大长方体 ) ,这种打包方法称为长方体规 Teacher Zhang Siming of Peking University High School Affiliated School has designed a teaching case of “packaging problem.” Here “packaging problem” refers to a cuboid object such as a number of cigarette packs, in accordance with the requirement that two adjacent objects in the package must be congruent at the time of packing. The two sides are docked, and the package is still a rectangular body. This requirement is to make these small rectangular bodies into a large package (large rectangular body). This packing method is called a rectangular shape.