综合应用“自行车里的数学”(数学六年级下学期)是第三单元的比例后安排的。目的在于让学生运用所学的圆、排列组合、比例等知识解决实际问题。通过解决生活中常见的有关自行车的问题,了解数学与实际的广泛联系,建立数学求解模型,获得运用数学解决实际问题的思考方法,培养学生应用数学的意识,激发学习数学的兴趣。教学片断及其思考如下: Integrated application “Math in bicycle ” (math sixth grade semester) is arranged after the proportion of the third unit. The purpose is to allow students to use the circle learned, permutations and combinations of knowledge to solve practical problems. By solving the common bicycle problems in life, we can understand the extensive connection between mathematics and reality, establish the mathematical solution model, acquire the thinking method of solving practical problems by using mathematics, cultivate students’ awareness of applied mathematics and stimulate their interest in learning mathematics. Teaching pieces and their thinking are as follows: