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和角公式tan(圖解)
Author:
陳柄何
GeoGebra
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常见四边形是否是双心四边形
斐波那契螺旋弧线（表格法）
异形操场
比較五件物件的重量
盈利與虧蝕
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兩位數除法
指對數函數交點_2
S3 Law of Indices
進出刀量測-圓形
圓柱截面曲線
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Tangent Line or Tangent
Similar Triangles
Fractions
Matrices
Pyramid