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题库 / Prep2007E2-DS-192
Is xy > 0 ?
(1) x - y > -2
(2) x - 2y < -6
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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同理消去X,得y>4.所以XY>0
x - y > -2, 2y - x > 6,相加得y > 4
同时满足1\2条件的y只能大于3登录 或 注册 后可以参加讨论