题目内容
分母是8的真分数有________,其中最小的是________,最大的是________;
分子是8的假分数有________,其中最小的是________最大的是________.
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/15507.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/42886.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/43270.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/161957.png)
![](http://thumb.1010pic.com/pic5/latex/8647.png)
![](http://thumb.1010pic.com/pic5/latex/137.png)
![](http://thumb.1010pic.com/pic5/latex/66557.png)
![](http://thumb.1010pic.com/pic5/latex/2919.png)
![](http://thumb.1010pic.com/pic5/latex/190399.png)
![](http://thumb.1010pic.com/pic5/latex/524.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
![](http://thumb.1010pic.com/pic5/latex/161957.png)
分析:在分数中,分子小于分母的分数为真分数;分子大于或等于分母的分数假分数.据此定义即能确定分母是8的真分数有哪几个,分子是8的假分数有哪几个,并由此分别确定其中最大与最小的分数.
解答:根据真分数与假分数的定义可知,
分母是8的真分数有
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/15507.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/42886.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/43270.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
分子是8的假分数有
![](http://thumb.1010pic.com/pic5/latex/161957.png)
![](http://thumb.1010pic.com/pic5/latex/8647.png)
![](http://thumb.1010pic.com/pic5/latex/137.png)
![](http://thumb.1010pic.com/pic5/latex/66557.png)
![](http://thumb.1010pic.com/pic5/latex/2919.png)
![](http://thumb.1010pic.com/pic5/latex/190399.png)
![](http://thumb.1010pic.com/pic5/latex/524.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
故答案为:
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/15507.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/42886.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/43270.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/161957.png)
![](http://thumb.1010pic.com/pic5/latex/8647.png)
![](http://thumb.1010pic.com/pic5/latex/137.png)
![](http://thumb.1010pic.com/pic5/latex/66557.png)
![](http://thumb.1010pic.com/pic5/latex/2919.png)
![](http://thumb.1010pic.com/pic5/latex/190399.png)
![](http://thumb.1010pic.com/pic5/latex/524.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
![](http://thumb.1010pic.com/pic5/latex/26286.png)
点评:根据真分数与假分数的定义确定题目中分子或分母的取值范围是完成本题的关键.
![](http://thumb2018.1010pic.com/images/loading.gif)
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