加减乘除吧。您给他们用中文讲讲几何试试。。。

来源: borisg 于 2018-02-26 13:11:29 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.

Change Ad Consent