趁热打铁,

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 ?




登录后才可评论.