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三角形三內角和
Author:
chuck.ncyu
GeoGebra
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兩位數加法
找出對稱軸
柱體建築師
畫出對稱圖形
兩位數除以一位數（二）
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math test
拋物線的光學性質
双曲线的参数方程
BkD_act15_05c
試作
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Vectors
Secant Line or Secant
Optimization Problems
Function Graph
Logarithm