file:9.mp4 file:4.avi file:16 正交变换.avi file:15考研 汤家凤线代基础模块精讲 005.avi file:12 定量描述（2）.avi file:考研数学线性代数强化讲义.pdf file:李永乐线代冲刺笔记.doc file:2013李永乐冲刺线代06.mp4 file:2014数学强化线代-李永乐9.mp4
file:9.mp4 file:4.avi file:16 正交变换.avi file:15考研 汤家凤线代基础模块精讲 005.avi file:12 定量描述（2）.avi file:考研数学线性代数强化讲义.pdf file:李永乐线代冲刺笔记.doc file:2013李永乐冲刺线代06.mp4 file:2014数学强化线代-李永乐9.mp4