正文

Kahn Academy SAT Math Preparation

(2012-09-21 23:44:00) 下一个
    
Kahn Academy SAT Math Preparation


http://www.khanacademy.org/#sat-math

Bill Gates used this site to help his children in math!
 
[ 打印 ]
[ 加入书签 ]
阅读 () ┆ 评论 (0)
评论
目前还没有任何评论
登录后才可评论.