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题库 / Prep2007E1-DS-99
If m > 0 and n > 0, is ~$\frac{m+x}{n+x}> \frac{m}{n}$~ ?
(1) m < n
(2) x > 0
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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(1)不充分，可大可小，（2）也不充分，若m=n则（1+1）/（1+1）=1/1，但是m1/2
(1)(2)m0，则充分
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