趁热打铁，

来源: 于 2012-12-28 22:52:17 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

你自己或你家小孩试试这个， answer each question with 5 seconds and post your answers:

Assume a=1, b=2, and so on,

Q1 what is c?

Q2 what is x?

Q3 what is a+b ?

Q4 what is b+y ?

Q5 what is x+x ?