jj总结中的2个题目

A and B are two
points in a line , and point C is between AB in the line . Point D is not in
the line with DA=DB , which of the following is true :

 1) 
DA>DC  2) DA>AC 3)DB>CB 4).... 

x is 10% greater than y ;z is 20% less than x.求個比例式的值

jj说没办法做。我猜测是不是这个意思？
---X+X*10%=Y  Z-Z*20%=X

请大家检查看看，讨论一下

第一题,其实画出图的话,可以看出来,DA肯定永远大于DC....

第二题,我觉得mm说的是对的.呵呵

求助NN !