在教学“比例的基本性质”(苏教版六年级下册)一课时,当揭示比例的基本性质后,出示了书上的“试一试”:试一试应用比例的基本性质,判断下面的两个比能否组成比例。如能组成比例,把组成的比例写出来。3.6:1.8和0.5:0.25()×()=()()×()=()学生利用比例的基本性质,经过计算得出3.6×0.25=0.9,1.8×0.5=0.9,所以3.6:1.8和0.5:0.25可以组成比例。本以为这个环节教学任务已经完成,不料刘××却高高的举起手。下面是课堂的对话:师:你还有什么问题?生:陈老师,我觉得利用比的基本性质进行判断 When teaching a lesson in “The Basic Nature of Proportions” (the sixth edition of the Yearbook of the Sujah ​​version), after revealing the basic nature of the ratio, we present the “Try It Out” on the book: try the basics of the application scale Nature, to determine whether the ratio of the following two than the composition. If you can make up the proportions, write down the proportions of the composition. 3.6: 1.8 and 0.5: 0.25 () x () () () x () = () The students use the basic properties of the ratio, calculated by 3.6 × 0.25 = 0.9,1.8 × 0.5 = 0.9, so 3.6: 1.8 And 0.5: 0.25 can form a ratio. I thought this part of the teaching task has been completed, but unexpectedly Liu × × raised his hand. The following is a dialogue in the classroom: Teacher: What are your problems? Health: Teacher Chen, I think the basic nature of the use of ratio to judge