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集合1
Author:
sschy
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
盈利與虧蝕
异形操场
中华人民共和国国旗
活动三：应用性质
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Proof of Pythagoras Theorem(1) 畢氏定理的証明(1)
Demonstration of the angles at the same segment
比較角的大小
比較分數大小
四邊形的特性
Discover Topics
Equations
Geometry
Conic Sections
Congruence
Pythagoras or Pythagorean Theorem