电子课本
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知识点
1.比的意义:
两个数的比表示两个数相除。比是除法的另一种表示形式,可以是同类量的比,也可以是不同类量的比。写比时,有时也可以写成分数的形式。
2.比由两项组成,每个比都有比值。
3.在两个数的比中,比号前面的数叫比的前项,比号后面的数叫比的后项,比值就是比的前项除以后项所得的商。
4.用字母表示比与除法、分数之间的关系:
![](http://daogezhiyuan-article.oss-cn-beijing.aliyuncs.com/win3000/pic/c9cf7720-bb67-434a-8ea5-5a8711b5ace9.jpg)
5.比和分数、除法之间的区别
![](http://daogezhiyuan-article.oss-cn-beijing.aliyuncs.com/win3000/pic/b98280ea-8cb6-4212-b375-dcd10006c374.jpg)
6.比的后项不能是0。
比的后项相当于除法算式中的除数,也相当于分数中的分母,因为除数和分母都不能为0,所以比的后项也不能为0.
参考答案
第49页 做一做
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图文解读
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当堂检测
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同步练习1
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同步练习2
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