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题库 / Prep2007E2-DS-65
If ab ≠ 0 and points (-a, b) and (-b, a) are in the same quadrant of the xy-plane, is point (-x, y) in this same quadrant?
(1) xy > 0
(2) ax > 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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题目条件的意思是ab>0，即ab同正或者同负。因为a,b值不确定，所以另一个点在同一象限需要 1. X坐标正负相同，ax>0. 2. xy同好，即xy>0.所以选C.
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