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gyzel 橢圓的反射
Author:
均一
GeoGebra
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百分數及其應用
讀磅
三角函数 的副本
垂直線的斜率
祖冲之的期望：内棋与外棋
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證平行四邊形 (對角線互相平分) (對邊 // 且相等)
角柱
橢圓的副本
函數圖形的變換
圆与圆的位置关系
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Definite Integral
Vectors 2D (Two-Dimensional)
Straight Lines
Root
Coordinates