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Author:
S CHOW
GeoGebra
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折扣
斐波那契螺旋弧线（表格法）
盈利與虧蝕
平行線的判定
常见四边形是否是双心四边形
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Lagrange
畢式定理 (10)
三角函數 Cos X 函數圖形
同底等高的三角形面积相等.许兴华数学
K1+k2
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Linear Equations
Power Functions
Logarithmic Functions
Rhombus
Cosine