Question

$250$ 的两个最小质因数之和是多少？

What is the sum of the two smallest prime factors of $250?$

$2$

$5$

$7$

$10$

$12$

答案：C

知识点：质因数分解

难度评级：560

解答：

对 $250$ 分解质因数： $250 = 2 \cdot 5^3.$ 因此 $250$ 只有两个质因数： $2$ 和 $5$ 。它们的和为 $7$ 。

所以正确答案是 C。

We can prime factorize $250$ to get $250 = 2 \cdot 5^3.$ From this, we can see that $250$ only has two prime factors: $2$ and $5.$ The sum of these is $7.$

Thus, C is the correct answer.

2007 AMC 8 第 3 题

答案：C

难度评级：560

解答：

其他年份的第 3 题