If n is a multiple of 5 and n=(p^2)q, where p and q are prime numbers, which of the following must be a multiple of 25?
A P^2 B. q^2 C pq D(p^2)(q^2) E. (p^3)q
D?
我的思路:因为(p^2)q是5的倍数,而且p q都是质数,那么p 或者是q肯定有一个是5,如果p=5,(p^2)(q^2)就有两个5,也就是25,如果q=5,那么D也成立。
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