prep会不会有错题啊，同学们？吐血跪求一个数学题的答案，想的头发都要拔掉了

ydleo

把三个图画在第一象限 很容易就分辨出来了

紫小妮

这道还好  我作的那个更离谱  我问了好久个人  大家都说答案不对  
大家帮看看

DS：on the number line，distance between a and b is 5，distance between b and c is 20，does c lie between a and b
1：distance between a and b is 25
2:  point a is to the left of point b

答案选A

谢拉

沉睡的巨人

这道还好  我作的那个更离谱  我问了好久个人  大家都说答案不对  
大家帮看看

DS：on the number line，distance between a and b is 5，distance between b and c is 20，does c lie between a and b
1：distance between a and b is 25
2:  point a is to the left of point b

答案选A

谢拉

-- by 会员 紫小妮 (2011/1/21 13:49:09)

这个我咋觉得不管下面的条件，c也不可能在a b之间，ab距离5，c再怎么放也不可能在ab之间要使它距离b是20

evanwow

原题应该如下:
On the number line, the distance between point A and point C is 5 and the distance between point B and point C is 20. Does point C lie between A and B?

1) The distance between point A and point B is 25
2) Point A liest to the left of Point B.

1)因为AB的距离25 等于 5(AC)+20(BC) 如果C不在AB之间 就不可能达成 所已确定C在AB之间
  ==> 1)可求得确定答案
2)A在B点左侧 ABC三者关系可能如下 (i)C [5] A [15] B 或是 (ii)A [5] C [20] B
  ==>2)有两种可能
所以选(A)正确!