“租车(船)”是新教材中典型的思考题,也是综合性较强的生活实际问题,各种版本教材都有这部分内容。这类题目的问题大都是设计最合算、最省钱的租车(船)方案,教材建议渗透“列表”解决问题,通过比较寻找最佳方案,培养有序思维,掌握解决问题的策略。但有些题目一一列举出所有方案比较麻烦,复杂的计算费时费力,如不能完全列举,可能绞尽脑汁想出的种种方案未必有最省钱的。看来,在解决问题时,让学生 “Rental car (boat) ” is a typical problem in the new textbook, but also a comprehensive and practical life problems, all versions of textbooks have this part. The problems of such topics are mostly designed the most cost-effective car rental (boat) program, teaching materials recommended infiltration “list ” to solve the problem, through the comparison to find the best program to develop an orderly thinking, master the problem-solving strategy. However, some questions may be cumbersome to enumerate for all. Complicated calculations are time-consuming and laborious. If not fully listed, solutions that may have been racking their brains do not necessarily have the most economical solution. It seems that when it comes to solving problems, let the students