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.
分析:根据题干不等式,可推知x,y不同号,z,y不同号
当y>0时,x>z;当y<0时,z>x。
(1) 若z<x,y>0,那么zx都为负,随便套个数就等于这个公式
(2) y>0就可得x>z,且两个都是负数,同上。
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