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正切线
Author:
chiwanqing
GeoGebra
New Resources
四邊形的特性
算柱 (兩位數)
異分母分數減法
兩位數加法
第八周作业
Discover Resources
rainbow
Triangle fixed height
波羅摩及多定理
橢圓的定義（by Jutor）
二元线性规划的图解法(习题4)
Discover Topics
Derivative
Parametric Curves
Scalene Triangles
Straight Lines
LCM and GCD