file:整式加减-无关不含问题.mp4 file:化简求值-直接代入法.mp4 file:9.同类项.mp4 file:9、有理数的巧算-答案.pdf file:22、线与角的动态问题.pdf file:21、角度计算 -答案.pdf file:16、含参一元一次方程.pdf file:数轴上点的移动.mp4 file:绝对值的几何意义进阶版.mp4 file:分数裂项（2级怪）.mp4 file:应用题：应用题-分段计费.mp4 file:切片：整体代入练习.mp4 file:切片：应用题-行程问题之顺风逆风.mp4 file:【线与角切片】钟面角.mp4