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发表于 25-12-2009 07:16 PM
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我们可以用
方法一:LCM Algorithm 或
方法二:“先找factors,后在factors当中找出prime numbers,所以这些就是prime factors”。
For instance,
Find the prime factors of 1350.
方法一: LCM Algorithm(很快的方法)
2 1350
3 675
3 225
3 75
5 25
5 5
1
Therefore, the prime factors are 2,3,and 5.
方法二:(很慢的方法)
1350 = 1 x 1350
= 2 x 675
= 3 x 450
= 5 x 270
= 6 x 225
= 9 x 150
= 10x135
The factors of 1350 are 1,2,3,5,6,9,10,135,150,225,270,450,675, and 1350.
From the factors above, the prime factors are 2,3 and 5. |
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