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1989全国文15
Author:
常振虎
GeoGebra
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兩位數加法
異分母分數減法
四邊形的特性
兩組對邊相等的四邊形
球體建築師
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第一冊
星八面體
模擬隨機變數的「總和」的副本
螺旋正方形
靜態幾何錯視圖
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Stochastic Process or Random Process
Straight Lines
Division
Normal Distribution
Tangent Line or Tangent