1995 AMC 8 第 22 题
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22.
数 可以写成一对正的两位数的乘积。这一对数的和是多少？
The number can be written as a product of a pair of positive two-digit numbers. What is the sum of this pair of numbers?
小提示：
求 的质因数分解
Find the prime factorization of
大提示：
把质因数分成两个都在 到 之间的数
Group the prime factors into two numbers that are each between and
解答：
质因数分解为 。要分成两个两位因数，可以配为 和 。
这是唯一的两位数配对，它们的和是 。
所以正确答案是 A。
The prime factorization is To split into two two-digit factors, pair the primes: and
These are the only two-digit pair, and their sum is
Thus, the correct answer is A .
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