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数学广角练习题  

2013-12-13 13:52:19|  分类: 数学资料 |  标签: |举报 |字号 订阅

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1、用一只平底锅煎饼,每次只能放两个,剪一个饼需要2分钟(规定正反面各需要1分钟)。问煎3个饼至少需要多少分钟?怎么煎?

2、小华用平底锅烙饼,这只锅同时能放4个大饼,烙一个要用4分钟(每面各需要2分钟)。可小华烙6个大饼至少要用几分钟?他是怎样烙的?(提示:先放入四个饼烙2分钟,取出两个,另两个翻一面,再放入两个生的,2分钟后取出两面都熟的两个,另两个翻面,放入原先取出的一面已经烙好的两个,2分钟后6个饼都好了)

3、用一只平底锅烙大饼,锅里只能同时放两个。烙熟大饼的一面需要3分钟,现在要烙3个大饼,最少要烙几次?需要几分钟?

4、用一只平底锅烙大饼,锅里只能同时放三个。烙熟大饼的一面需要3分钟,现在要烙10个大饼,最少要烙几次?需要几分钟?

5、小虎早晨要完成这样几件事:烧一壶开水需要10分钟,把开水灌进热水瓶需要2分钟,取奶需要5分钟,整理书包需要4分钟。他完成这几件事最少需要多少分钟?

6、在早晨起床后的1小时内,小筯驳n id="$龅囊幻嬉褄e54分钟‖取XT-∈蹦赿efocus="true" hdiv> 刷牙8这几件读外语3樱∧坛栽绮1樱∧淌胀氩磷郎这几件收听广播3樱 ="TEXT-INDENT: 2em;" >6、在早晨起床后的1小时内,小筯7、甲、乙、丙三人分别拿着2在尧钟!1个硎分钟到达要5分┯Φ愦颥整馈,整懒分挥些。棵娑2分安排他们打水的次序,可以使他们打所花的总时间e="T2em;" >2、小华用平底锅烙饼,这只锅同时8、甲、乙、丙三人到商场批发部洽谈业务各凶、乙、丙三人EXT-的时间分别是1樱 16这几和8这几。2分安排,使3人所花的时间e="T2ee="T时间是INDE? cl" >3、用一只平底锅烙大饼,锅里只能 2em;"cl" >3、用一只平底锅烙大饼,锅里只能 2em;"cl" &n

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\r\n>2、小华覾"平底锅煎饼,每次謀荒芊\拍芊4个大饼,烙一个要用4分钟(每面各需要2分钟)。可小华烙6个大饼至少要用几分钟?他是怎样烙的?(提示:先放入四个饼烙2分钟,取出两个,另两个翻一面,再放入两个生的,2分钟后取出两面都熟的两个,另两个翻面,放入原先取出的一面已经烙好的两个,2分钟后6个饼都好了)

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