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标题: 请教GWD一道题 [打印本页]

作者: huangluyao 时间: 2009-12-11 07:31 标题: 请教GWD一道题

If s⁴v³x
⁷ < 0, is svx < 0?
(1) v < 0

(2) x > 0

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.

我认为选C，但答案是E. 请高手解答。谢谢！

作者: lansere 时间: 2009-12-11 19:40

1和2其实是等价的。
S^4* V^3 * X^7 < 0 --> S可为正负，V和X必定异号。
1和2的条件只能推出V和X异号，其实这个结果已经包含在题干中了。剩下S不知道正负，所以推导不出来svx < 0

作者: jedimin 时间: 2009-12-13 06:58

因为
S可正可负
所以无法确定

作者: huangluyao 时间: 2009-12-14 07:00

哦，明白了。谢谢！

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