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差倍问题

一、课堂练习：

例1．星期天，小明和他爸爸一起去钓鱼。爸爸比小明多钓18条鱼，爸爸钓的条数是小明的3倍。小明和爸爸各钓多少条鱼？

练习1：甲数加上152等于乙数，乙数是甲数的5倍，甲、乙两数各是多少？

例2．学校书法组比电脑组多84人。书法小组的人数比电脑小组的4倍少12人。两个兴趣小组各有多少人？

练习2：杨大伯养了一些鸡和鸭。鸡的只数比鸭的5倍多16只，鸡比鸭多140只。杨大伯弄的鸡和鸭各有多少只？

例3．水果商店有梨4000千克，有苹果2400千克，两种水果各卖出相等的重量。剩下的梨恰好是剩下

的苹果的5倍。两种水果各剩下多少千克？

练习3：化肥厂东仓库有化肥600袋，西仓库有化肥480袋，从两个仓库各运走同样多的化肥以后，东仓库剩下的化肥是西仓库的3倍，两个仓库各剩下多少袋？

例4．两块同样长的布。第一块剪去72米，第二块剪去24米。剩下的布第二块是第一块的4倍。这两块布现在各有多少米？

练习4：两堆煤重量相等，第一堆运走18吨，第二堆运走32吨，第一堆剩下的吨数是第二堆的3倍。两堆煤现在各有多少吨？

例5．原来小明比小红多80元，小红给小明30元后，小明的钱正好是小红的3倍。两人原来各有多少元？

练习5：甲桶油比乙桶油重100千克。如果从乙桶倒出25千克油给甲桶，那么甲桶的重量是乙桶的2倍。甲乙两桶油原来各重多少千克？

二、巩固练习:

1、两根绳子，长的一根为42米，短的一根为18米。两根绳子剪去同样长的一段后，长的一根是短的

一根长度的4倍。问：两根绳子现在各长多少米？

2、水果店有重量相同的苹果和桔子。如果苹果卖出95千克，桔子又放进65千克，这时桔子重量是苹果的5倍，原来苹果桔子各有多少千克？

3、原来四(1)班比四(2)班多28本图书。如果四(2)班给四(1)班25本图书后，四(1)班正好是四(2)班的4倍。两班原来各有多少本图书？

4、小丽和小荣集邮，小丽邮票的张数是小荣的5倍，如果小丽把自己的邮票给小荣100张，她俩邮票的张数正好相等。小丽和小荣各有多少张？

5、骡子和驴子驮着谷物，骡子对驴子说：“如果你把驮的谷物给我一包，我驮的就是你的2倍，可是，如果我给你一包，咱俩就相等了，”你们说一说，他们各驮了多少包谷物？

6、甲、乙两位学生原计划每周做同样数量的练习题，实际上甲每周多做了18道题，而乙偷懒每周少做了14道题，结果乙三周的做题量只相当于甲一周的做题量．请问：他们原计划每周做几道题？

三、回家作业：

1、学校美术兴趣小组中女生人数比男生人数多82人，女生人数比男生人数的3倍少8人。男女生各有多少人？

2、弟弟做的口算题比哥哥少275道。哥哥做的口算题比弟弟的6倍少5题。两人各做口算题多少道？

3、两根绳子，第一根比第二根长6米，从两根绳子上各剪去1米，第一根的长度是第二根的4倍，两根绳子原来各长几米？

4、某牧场上山羊与绵羊同样多。如果卖出山羊360只，买进绵羊170只，那么绵羊的只数比山羊的6倍多30只。牧场上原来有山羊和绵羊各有多少只？

5、小东比小兰多68张邮票。小东给小兰15张，这时小东的邮票是小兰的2倍。两人原来各有多少张？

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