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标题: 求助 一道prep数学题 [打印本页]

作者: littlestoner    时间: 2007-9-2 15:44     标题: 求助 一道prep数学题

有一张图,是一个数轴,从左到右依次是r,s,t三点
题目是DS题:
Is zero at the halfway of r and s?
(1) s is to the right of zero
(2) the distance between t and r is the same as the distance between t and -s

答案是C好像,但我觉得应该是B阿?有xdjm遇到过这道题还有印象的么?谢谢

作者: dbearwangs    时间: 2007-9-2 19:18

如果0再S的右侧,则2完全有可能,比如r=-4,s=-2,t=-1,-s=2
作者: littlestoner    时间: 2007-9-3 14:10

多谢多谢,呵呵,难怪想半天没想清楚,原来潜意识里把t当作大于-s了,呵呵,:)




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