7月JJ 006 (6月 JJ 189)

jefferyli

189.AB

      BA

     CDE

A and B is the tenth digit and unit digit of a two digit number respectively. The product of A, B is the three digital number CDE. A is not equal to B. What is CDE?
a)     A=E
b)     A=C
Dingdang: 题目不全或有误? A, B既然是某个数的十位和个位数, 则A, B<= 9, A*B怎能是三位数?
刚刚醒悟，　可能是ＡＢ*BA = CDE.
那么:　Ｃ　　　（Ａ＝２，　Ｂ＝１）

dingdang更正:　Ｂ

=>请教思路？谢谢!

jefferyli