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因式分解二次方程
Author:
Chris Cheng
GeoGebra
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三位數除以一位數（一）
直角坐標平面上的旋轉變換
兩位數加法
【案例】圆柱体内放置一个大球六个小球
算柱 (兩位數)
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堆垛六顆鬼東西
可积准则
Geometric Meaning of Derivatives
雙曲線3 等軸法
Quiz on Solving One-step Linear Equations (1)
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Histogram
Diagrams
Sequences and Series
Conic Sections
Random Experiments