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二倍角的正弦公式的证明
Author:
桃篮翁
GeoGebra
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算柱 (兩位數)
四邉形 (四年級) 教師版
畫出對稱圖形
兩組對邊相等的四邊形
【案例】2018年全国1卷理科12题
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Locus 軌跡(3T)
直式算式(可包含單位)
剪刀石頭布
Diagram 1
Copy of 分數比較
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Tree Diagrams
Root
Arithmetic Operations
Means
Special Points