(10a+b)-(a+b)=9a

based on the rule, the results can only be 9, 18, 27... 81. all the symbles corresponding to these numbers are the same. once you clicked the retest button, the whole set will be reset.

所有跟帖： 

• symbol >_< II -Hotmale- ♂ (0 bytes) () 08/06/2009 postreply 10:29:37

• you are so smart!!! -zclin2000- ♂ (0 bytes) () 08/07/2009 postreply 18:21:19