file:2012春季四年级数学竞赛班.doc file:排列组合综合应用（下）例7.mp4 file:测试9.doc file:电梯与发车间隔问题例6-例7.mp4 file:最值问题例8.mp4 file:等积变形（下）例5-例6.mp4 file:等积变形（上）.doc file:格点与割补知识点.mp4

file:组合（下）例7.mp4 file:排列（下）.doc file:应用题综合知识点.mp4