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任意凸多边形的滚动
Author:
赵林
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
三位數除以一位數（一）
兩位數除以一位數（一）
錐體建築師
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龍騰4_1-1課例2
整數或分數÷分數_ 工作紙（一）_題1d
方向導數 (Directional Derivative)
因式分解二次方程
追击问题
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Differential Equation
Difference and Slope
Addition
Diagrams
Trigonometry