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S12G4 長方形內夾正方形的周長問題
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学用数学
GeoGebra
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找出對稱軸
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
兩位數加法
三位數除以一位數（一）
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Quiz on Joint Variation 聯變：測驗
y=2^x指數函數圖形
Copy of gjc091b18 圓的割線
面積2
根據百分率找數量（二）: 例4的副本
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Arithmetic Mean
Inequalities
Upper and Lower Sum or Riemann Sum
Rhombus
Triangles