1998 AMC 12 第 6 题
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6.
把 写成两个正整数的乘积，并使这两个正整数的差尽可能小，则这个差为
If is written as a product of two positive integers whose difference is as small as possible, then the difference is
答案：C
小提示：
分解 ，并寻找接近其平方根的因数
Factor and look for divisors near its square root
大提示：
最接近的一对因数由 及另一个因数组成
The closest factor pair is formed from and the remaining factor
解答：
因为 ，最接近 的因数对是 。它们的差为 ，正确答案是 C。
Since its factor pair nearest is Their difference is so C is correct.
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