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1989全国文24
Author:
常振虎
GeoGebra
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錐體建築師
異分母分數減法
四邊形的特性
球體建築師
拼砌四邊形
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chap. 1 by ck
mearm機械手臂模擬
截痕
圓柱體展開
勒洛四面体（拼接法）
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Vectors 2D (Two-Dimensional)
Circle
Parallelogram
Area
Mathematics