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题库 / Prep2007E2-DS-74
If ~$x\neq -y$~, is ~$\frac{x-y}{x+y}> 1$~ ?
(1) x > 0
(2) y < 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.
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
不等式两边不能同时乘以x+y，因为不知道x+y是正还是负；
（1）+（2），x+y可以是正值，也可以是负值
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