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标题: 请教另一道一道寂静。。。 [打印本页]

作者: Janekw    时间: 2011-4-18 09:01
标题: 请教另一道一道寂静。。。
DSX.Y都为正数,XYS都在同一数轴上。问是否X=Y1XS的距离=YS的距离 2.S小于0 我选C

恳请好心NN指教,怎么选C呢???。。。

作者: sdcar2010    时间: 2011-4-18 09:14
1) S could be the middle point between X and Y
2) S is smaller than zero cannot garantee X = Y

1) and 2), S cannot be the middle point between X and Y.  Sufficient.
作者: Janekw    时间: 2011-4-18 10:27
万分感谢!!
祝您考试人品大发,750+哈!!




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