factor...

2006-10-26 9:42 pm
If i want to find the factors of 126.
how can i find it easily?

回答 (6)

2006-10-26 9:52 pm
✔ 最佳答案
2x63
3x42
6x21
7x18
9x14

循這個方法去諗,就唔會漏!去到18同埋14,因為18=3x6,14=2x7

2006-10-26 13:54:16 補充:
當然仲有1x126我自己都miss咗!
好似咁列出囉:
1x126
2x63
3x42
6x21
7x18
9x14
2006-10-27 12:48 am
1,2,3,6,8,9,14,16,21,42,63,126
[sol.]
1*126(這是必然的)
2*63 (它是雙數)
3*42 [由左到右的數字加起來是三的倍數(1+2+6)]
6*21 (由左到右的數字加起來是三的倍數而且它是雙數)
8*16 (可以被8整除)
9*14 (由左到右的數字加起來是九的倍數)
參考: myself
2006-10-26 10:00 pm
1,2,3,6,7,9,14, 8,42,63,126
2006-10-26 10:00 pm
Try to divide the number by prime numbers, e.g. 2, 3, 5, 7…., until it is not divisible anymore…and convert the number into a series of multiples of prime numbers....

The prime number(s) that can divide the number will be a factor of the number....

Therefore 126 =
2 * 3 * 3 * 7 =
(2) (3)^2 (7)
2006-10-26 9:50 pm
1, 2, 3, 6, 7, 9, 14, 18, 42, 63, 126


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