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play tennis
Author:
李春培
play tennis
GeoGebra
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判斷球體
直角坐標平面上的旋轉變換
四邊形的特性
算柱 (兩位數)
【案例】2018年全国1卷理科12题
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教學－橫切面
畢氏定理證明（Ｉ）
圆的面积原理
金惠吉：正弦交流电演示
简谐振动函数图像
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Rational Numbers
Addition
Linear Programming or Linear Optimization
Optimization Problems
Set Theory