滚动问题的运动分析──对初三几何新教材第１８９页“想一想”的讨论山西省太原市第２９中学薛喜娥山西省太原工业大学刘俊明九年义务教育三年制初级中学教科书《几何》第三册第１８９页的“想一想”原题如下“如图，如果⊙０的周长为２０πｃｍ，Ａ、Ｂ的周长都是４πｃ... Movement Analysis of Rolling Problems ─ ─ Discussion on “Thinking of a New Dream” on the New Textbook of Geography in Junior Middle School 29/28th Middle School in Taiyuan, Shanxi Province Xue Xifu Shanxi Taiyuan University of Technology Liu Junming 9-year Compulsory Education Three-year Primary School Textbook Geometry The first question of “thinking” in the third volume of page 189 is as follows: “If the perimeter of ⊙0 is 20πcm, the perimeter of A and B is 4πc...