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题库 / Prep2007E1-DS-38
If r and s are positive integers, is ~$\frac{r}{s}$~ an integer?
(1) Every factor of s is also a factor of r.
(2) Every prime factor of s is also a prime factor of r.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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is r/s an integer？-->r=ns?-->s的每个因子*n都能被r整除?-->s的每个因子都能被r整除?=(1)
(2)s的因子包括1,s,质因子,质因子的不等于s的乘法组合. s的质因子能被r整除，没有考虑s的质因子的乘法组合是否能被r整除。
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