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二年級_錐體的觀察
Author:
chan
GeoGebra
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算柱 (兩位數)
找出對稱軸
異分母分數減法
拼砌四邊形
三位數除以一位數（二）
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兩直線夾角101.11.21
能量守恆
angles sum of a triangle 3
平均線
腳踏車風火輪
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Integers
Secant Line or Secant
Hypergeometric Distribution
Combinatorics
Natural Numbers