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.
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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