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Angles associated with Parallel Lines 三線八角
Author:
Hui Sir
GeoGebra
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三位數除以一位數（一）
畫出對稱圖形
兩組對邊相等的四邊形
四邊形的特性
算柱 (兩位數)
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數線(小數的認識)
Example 6.1
三次函數圖形變化觀察
比較分數的大小(小六)
拋物線3--平行四邊形法
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Statistics
Angles
Upper and Lower Sum or Riemann Sum
Median Value
Real Numbers