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勾股定理
Author:
许业成
GeoGebra
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平行線的判定
盈利與虧蝕
椭圆内切圆链
中华人民共和国国旗
龙形曲线-分形龙
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二項分布與抽樣 (iPad 適用)
Quiz on Addition and Subtraction of Directed Numbers (1) 有向數加減測驗(1)
递推关系具有分支选项的递推数列
equations of circle 1
Q5
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Subtraction
Cuboid
LCM and GCD
Quadrilaterals
Constructions