B'C=mx,A'B'=B'C'=C'A'=m. Why?

来源: 于 2013-10-31 13:01:38 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

You wrote CC'=nx.  But  CC'=x, so n=1.  Why do you need n?