If zy < xy < 0, is |x - z| + |x| = |z| ?
(1) z < x
(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.
此题不需要两个选项就能恒成立,这也是正向推导的结果;不过做题的时候为快捷,还是从选项出发逆向验证比较快。
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