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Author:
Tong Wing Hong
GeoGebra
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平行線的判定
中华人民共和国国旗
盈利與虧蝕
龙形曲线-分形龙2
直線的斜率：水平變化 & 鉛垂變化
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兩函數間面積
極座標方程式
Is this a prism 2
TRY_4.11.2016
函數平移
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Congruence
Linear Equations
Surface
Division
Distributions