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Author:
赵林
GeoGebra
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拼砌四邊形
球體建築師
畫出對稱圖形
判斷球體
兩位數除以一位數（一）
Discover Resources
轉動的水箱
linear programing by Mr LO WY
作三角形
动圆与两圆外切与内切(2)
勾股定理的直观证明（义务教育数学 新课标-例82）
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Optimization Problems
Quadratic Equations
Planes
Mathematics
Linear Equations