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三角函数：单位圆与函数图象
Author:
acchu
GeoGebra
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異分母分數減法
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
判斷球體
兩位數加法
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排列組合
二元一次方程式1
二元线性规划的图解法(18.2 例5)
Graph of Quadratic Function
奥倍尔定理
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Mode
Parabola
Right Triangles
Linear Equations
Limits