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1、基础行程问题行程问题的基本公式:路程速度时间一、一般相遇问题【知识精讲】相遇问题指的是两人(物)在行进过程中相向而行,然后迎面相遇的问题。相遇问题考虑的是相同时间内两人(物)所行的路程和。相遇问题中路程、速度和时间三者之间的关系为:总路程=速度和 相遇时间其中“总路程”指两人(物)从出发(同时)到相遇时共行的路程,“速度和”指两人(物)在单位时间内共行的路程,“相遇时间”指两人(物)从出发(同时)到相遇时所经历的时间。例 1 甲乙两人分别从相距40 千米的两地同时出发相向而行,甲每小时走12 千米,乙每小时走8 千米两人多少小时后相遇?练习:1、一列客车和一列火车同时从两地相对开出,客车每小时
2、行60 千米,货车每小时行52 千米,经过3.5小时两车相遇。求两地之间的距离。2、两列火车同时从相距525 千米的两地相对开出,3 小时后相遇。一列火车每小时行90 千米,另一列火车每小时行多少千米?3、甲乙两车从相聚690 千米的两成相对开而行,甲车每小时行60 千米,甲车先行1 小时后乙车才出发,乙车每小时行80 千米。甲车开出几小时后与乙车相遇?例 2 甲每小时行7 千米,乙每小时行5 千米,两人于相隔18 千米的两地同时相背而行,多少小时后两人相隔 54 千米?练习:1、甲车每小时行6 千米,乙车每小时行5 千米,两车于相隔10 千米的两地同时相背而行,多少小时后两人相隔65 千米?
3、2、甲每小时行9 千米,乙每小时行7 千米,甲从南庄向南行,同时乙从北庄向北行经过3 小时后,两人相隔 60 千米南北两庄相距多少千米?3、东西两镇相距20 千米,甲、乙两人分别从两镇同时出发相背而行,甲每小时的路程是乙的2 倍,3 小时后两人相距56 千米两人的速度各是多少?例 3 甲乙两队学生从相距18 千米的两地同时出发,相向而行。一个同学骑自行车以每小时14 千米的速度,在两队之间不停地往返联络。甲队每小时行5 千米,乙队每小时行4 千米。两队相遇时,骑自行车的同学共行多少千米?文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O1
4、0H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3
5、HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z
6、3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10
7、 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9
8、U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4
9、文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:C
10、Z9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4练习:1、两支队伍从相距55 千米的两地相向而行。通讯员骑马以每小时16 千米的速度在两支队伍之间不断往返联络。已知一支队伍每小时行5 千米,另一支队伍每小时行6千米,两队相遇时,通迅员共行多少千米?2、甲、乙两人同时从两地出发,相向而行,距离是100 千米。甲每小时行6 千
11、米,乙每小时行4 千米。甲带着一只小狗,狗每小时行10 千米。这只狗同甲一道出发,碰到乙的时候,它就掉头朝甲这边走,碰到甲时又往乙那边走,直到两人相遇时。这只狗一共走了多少千米?例 4 甲、乙两车早上8 时分别从A、B两地同时相向出发,到10 时两车相距112.5 千米。两车继续行驶到下午1 时,两车相距还是112.5 千米。A、B两地间的距离是多少千米?练习:1、甲、乙两车同时从A、B两地相向出发,3 小时后,两车还相距120 千米,又行3 小时,两车又相距120 千米。A、B两地相距多少千米?2、甲、乙两车分别从A、B两地同时相向而行,8 小时后相遇,相遇后两车继续行驶,3小时后两车相距3
12、60 千米,求A、B两地的距离。文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 Z
13、B8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1
14、J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档
15、编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9
16、O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H
17、2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM
18、7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4二、一般追及问题【知识精讲】两物体在同一直线上运动所涉及的追及、相遇、相撞的问题,通常归为追及问题。有两个同向运动的物体,一个速度快,一
19、个速度慢,当速度慢的在前,速度快的过了一段时间就能追上它,这就产生了“追及问题”。这里说的追及问题特指同向追及。同向追及中路程、速度和时间三者之间的关系为:速度差追及时间=追及路程例 1 下午放学时,弟弟以每分钟40 米的速度步行回家.5 分钟后,哥哥以每分钟60 米的速度也从学校步行回家,哥哥出发后,经过几分钟可以追上弟弟?(假定从学校到家有足够远,即哥哥追上弟弟时,仍没有回到家).例 2 甲、乙、丙三人行走的速度分别是每分钟60 米、80 米、100 米,甲、乙两人在B地同时同向出发,丙从 A地同时同向出发追赶甲、乙,丙追上甲以后又过了10 分钟才追上乙,求A、B两地的路程?例 3 甲、乙
20、两人同时出发从A 镇到 B 镇,甲骑电动自行车每小时行24 千米,乙骑自行车每小时行14千米,甲出发30 分钟后发现忘带身份证了,于是返回A 镇,因取身份证耽搁了半个小时,再从A 镇出发,结果甲乙两人同时到达B 镇,求 A、B 两镇之间的距离文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O
21、10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3
22、 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1
23、Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C1
24、0 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K
25、9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O
26、4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:
27、CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4三、流水行船问题此类问题中有两个基本公式:v顺水=v船+v水v船=(v顺+v逆)/2v逆水=v船-v水v船=(v顺-v逆)/2例 1 甲、乙两港间的水路长208 千米,一只船从甲港开往乙港,顺水8 小时到达,从乙港返回甲港,逆水 13 小时到达,求船在静水中的速度和水流速度。例 2 某船在静水中的速度是每小时15 千米,它从上游甲地开往下游乙地共花去了8 小时,水速每小时3千米,问从乙地返回甲地需要多少时间?例 3 架飞机所带的燃料最多可以用6 小时,飞机去时顺风,每小时可以飞1500 公里,飞回时逆风,每小时可以飞12
28、00 公里,这架飞机最多飞出公里,就需往回飞例 4 一位少年短跑选手,顺风跑 90 米用了 10 秒钟在同样的风速下,逆风跑70 米,也用了 10 秒钟在无风的时候,他跑100 米要用秒例 5 船行于 120千米一段长的江河中,逆流而上用10小时,顺流而下用6小时,水速,船速文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9
29、U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4
30、文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:C
31、Z9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O1
32、0H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3
33、HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z
34、3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10
35、 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4练习:乙两港相距360 千米,一轮船往返两港需35 小时,逆流航行比顺流航行多花了5 小时.现在有一机帆船,静水中速度是每小时12 千米,这机帆船往返两港要多少小时?四、环形跑道在封闭的环形道上(圆形)同向运动属于追及问题,反向运动属于相遇问题。同时同地同向出发,其追及路程就是环形道一周的长。例 1 一个圆形荷花池的周长为400 米,甲、乙两人绕荷花池顺时针跑步。甲每分钟跑250 米,乙每分钟跑 200 米,现在甲在乙后面50 米,甲第二次追上乙需要多少分钟?例 2 甲、乙二人骑自行车从
36、环形公路上的同一地点出发,背向而行。现在已知甲走一圈的时间为75 分钟,如果在出发后第50 分钟甲、乙两人相遇,那么乙走一圈的时间是多少分钟?例 3 兄妹二人在周长30 米的圆形水池边玩,他们从同一地点同时出发,背向绕水池而行,兄每秒走1.3米,妹每秒走1.2 米,照这样计算,当他们第十次相遇时,妹妹还需走多少米才能回到出发点?文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O
37、8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2
38、M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7
39、M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4
40、C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB
41、8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J
42、6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编
43、码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4例 4 一位同学在360 米长的环形跑道上跑了一圈,已知他前一半时间每秒跑5 米,后一半时间每秒跑4米。求他后一半路程用了多少时间?例 5 一个圆的周长为1.26 米,两只蚂蚁从一条直径的两端同时出发沿圆周相向爬行。这两只蚂蚁每秒分别爬行5.5 厘米和 3.5 厘米。它们每爬1 秒,3 秒,5 秒(连续的奇数),就调头爬行。那么,它们相遇时,已爬行的时间是多少秒?练习:1、如图,有一个圆,两只小虫分别从直径的两端A与 C同时出发,绕圆
44、周相向爬行。它们第一次相遇在离 A点 8 厘米处的B点,第二次相遇在离C点 6 厘米处的D点。问:这个圆周的长是多少?2、环形跑道一周的长为400 米。甲、乙、丙三人绕跑道散步,同时从跑道边一点出发,乙与丙同向行走,甲与乙丙相背而行。甲第一次遇到乙后2 分钟遇到丙,再过 6 分钟第二次遇到乙。已知乙的速度是甲的23,求丙的速度。文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O
45、8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2
46、M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7
47、M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4
48、C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB
49、8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J
50、6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编码:CZ9O8O10H2M3 HM7M1Z3L4C10 ZB8K9U1J6O4文档编