AMC 8 1993 Problem 3
AMC8 1993 年第 3 题
整除与因数★★☆☆☆
Which of the following numbers has the largest prime factor?
以下哪个数有最大的质因数？
- A.39
- B.51
- C.77
- D.91
- E.121
正确答案 · Correct Answer
B
解析 · Solution
Solution 1
A. The prime factors of 39 are 3 and 13. Therefore, the largest prime factor is 13.
B. The prime factors of 51 are 3 and 17. Therefore, the largest prime factor is 17.
C. The prime factor of 77 are 7 and 11. Therefore, the largest prime factor is 11.
D. The prime factor of 91 are 7 and 13. Therefore, the largest prime factor is 13.
E. The prime factor of 121 are 11. Therefore, the largest prime factor is 11.
So, the answer is
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