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标题: 天山 5-32 [打印本页]

作者: piqiuwawa 时间: 2005-10-23 20:29 标题: 天山 5-32

If xyz ≠ 0, is x (y + z) = 0?
(1) ¦y + z¦ = ¦y¦ + ¦z¦
(2) ¦x + y¦ = ¦x¦ + ¦y¦
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is
sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.

MINE E

ANS C

请指教

作者: sammen 时间: 2005-10-25 13:58

同意,从条件只可以得出XYZ是同号的结果,所以E.

作者: piqiuwawa 时间: 2005-10-26 19:44

thanks a lot !!!!

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