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诱导公式四（原点对称关系）
Author:
桃篮翁
GeoGebra
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第八周作业3
祖冲之的期望：内棋与外棋
百分數及其應用
直線的斜率：水平變化 & 鉛垂變化
盈利與虧蝕
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test
一元二次不等式測驗
九點圓
Hamid Naderi Yeganeh Circle
兩圓位置關係及公切線
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Tangent Line or Tangent
Mode
Linear Functions
Similar Triangles
Median Line