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.
画图比较明晰一些,条件1和2代表的范围只在第一象限相交,所以xy>0,条件1和2联席的时候是充分的
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