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test2
Author:
chengshihfeng
GeoGebra
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直角坐標平面上的旋轉變換
四邊形的特性
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
近似值：有效數字
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games
Jiawen Yun
猴子攀樹
參數式_1
GeoGebra作圖─ＡＡＳ全等
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General Quadrilateral
Linear Equations
Calculus
Circumcircle or Circumscribed Circle
Upper and Lower Sum or Riemann Sum