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六年级奥数思维训练，结合图示与图表，逐步分析推导问题答案
第21讲逆推策略（二）：一次汽车拉力赛需要在沙漠上走6天，而每辆车只能带够4天的汽油，为了使一辆汽车通过沙漠，就必须有其它车辆为它加油，但其它车辆也不能因缺油而停泊在沙漠上。问至少要几辆车，才能帮助一辆汽车越过沙漠？
六年级奥数思维训练87/114
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