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Author:
谭伟
GeoGebra
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四邊形的特性
錐體建築師
球體建築師
第八周作业
兩位數除以一位數（一）
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excenter of triangle
優良作品1(孟倫)
分線比值
test
线面g
Discover Topics
Solids or 3D Shapes
Rectangle
Geometry
Definite Integral
Secant Line or Secant