file:目录.doc file:83 关于导数知识的强调.flv file:81 二次含参的单调区间问题.flv file:80 证明不等式.flv file:78切线方程练习题.flv file:77 切线方程问题-已知切线方程求参数.flv file:75 恒成立问题3.flv file:选修（坐标系与参数方程）.doc file:选修(矩阵与变换).doc