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黎曼和與積分
Author:
蕭富偉
GeoGebra
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兩組對邊相等的四邊形
球體建築師
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
柱體建築師
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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
DSE Circle-ACT06 Relationship of Tangents and Radius of a Circle
三角形面積公式B2
碎形
三視圖學生互動版
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Pyramid
Diagrams
Differential Calculus
Trapezoid
Solids or 3D Shapes