题目内容
用短除法把下面各数分解质因数.
8 16
54 72
45 56 64
80 48 96.
8 16
54 72
45 56 64
80 48 96.
分析:分解质因数就是把一个合数写成几个质数的连乘积形式,一般先从简单的质数试着分解.
解答:解:
8=2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/0fa19e29.png)
16=2×2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/42d60868.png)
54=2×2×3×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/be8d3076.png)
72=2×2×2×3×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/4a54ec61.png)
45=3×3×5
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/7439a175.png)
56=2×2×2×7
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/427da306.png)
64=2×2×2×2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/f866cce5.png)
80=2×2×2×2×5
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/3aa66ecb.png)
48=2×2×2×2×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/8e472f5e.png)
96=2×2×2×2×2×3.
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/e928567e.png)
8=2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/0fa19e29.png)
16=2×2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/42d60868.png)
54=2×2×3×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/be8d3076.png)
72=2×2×2×3×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/4a54ec61.png)
45=3×3×5
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/7439a175.png)
56=2×2×2×7
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/427da306.png)
64=2×2×2×2×2×2
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/f866cce5.png)
80=2×2×2×2×5
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/3aa66ecb.png)
48=2×2×2×2×3
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/8e472f5e.png)
96=2×2×2×2×2×3.
![](http://thumb.1010pic.com/pic3/upload/images/201311/77/e928567e.png)
点评:此题主要考查合数分解质因数的知识.
![](http://thumb2018.1010pic.com/images/loading.gif)
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