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三棱锥的三视图的副本
Author:
enming
,
DongHai Zhang
GeoGebra
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四邊形的特性
畫出對稱圖形
球体的体积推导
異分母分數減法
三位數除以一位數（二）
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整數或分數÷分數_ 工作紙（一）_題2c
三平行線上作正三角形
Ex5D#7
[洋葱] 费马点问题
集合的运算
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Real Numbers
Set Theory
Area
Sine
Polygons