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标题: [求助]明天考试,Prep中1道数学题求教!!! [打印本页]

作者: Freehorser    时间: 2007-11-17 06:32     标题: [求助]明天考试,Prep中1道数学题求教!!!

1. If m and r are two numbers on a number line, what is the value of r?

(1) The distance between r and 0 is 3 times the distance between m and 0;

(2) 12 is halfway between m and r.

我选了C,但答案是E。哪位NN解答一下吧?谢谢!!


作者: tuxiaoyangs    时间: 2007-11-17 19:15

(1)不充分,r可以大于0,也可以小于0。

(2)单独也不充分,不知道m or r的具体值

1&2, 也不行,m>0, 3om=or,get the key: r=18; m<0, get the other key: r=36.


作者: freedownload    时间: 2007-11-18 20:08

护照没签名就自己签啊。我晕,你就是在考场签都可以啊!
作者: Freehorser    时间: 2007-11-23 20:37

thanks !!!!!!!!![em05]




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