求助一道数学题！~~

Ajinglu

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 point A and point B ?

(1) The distance between point A and point B is 25.

(2) Point A lies to the left of point B.

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.

我觉得应该选D,因为B.C之间的距离不是就限定了B只能在AC（C处的外侧）吗~~  但答案给的是A ~在线求助！谢谢~~

honda566

..B 的话，   以A为基点，C可以在A的左右两侧；如果C在右侧，B也可以在C的右侧，这样 满足了 A在B的左边的条件AB=25；如果C在A的左侧， B在C的右侧，这样AB=15,B仍然在A的右侧  ，right?

Ajinglu

honda566 发表于 2017-7-25 10:43
..B 的话，   以A为基点，C可以在A的左右两侧；如果C在右侧，B也可以在C的右侧，这样 满足了 A在B的左边的 ...

！！明白了~~~谢谢~~~

不能告诉你

直线问题你可以在空间上画三个点三角形abc 根据a 两边只和等于第三边，c点必定落在ab之间
第二个的话 c可以在a左边 没法解释

Ajinglu

Ajinglu 发表于 2017-7-25 11:15
！！明白了~~~谢谢~~~

好的！我明白了~谢谢！