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橢圓內的光線反射 獻給聰哥
Author:
宋政蒲
Topic:
Ellipse
,
Reflection
橢圓內的光線反射
GeoGebra
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三位數除以一位數（一）
直角坐標平面上的旋轉變換
算柱 (兩位數)
異分母分數減法
找出對稱軸
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Roger Test Draw
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扇形面積公式
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Addition
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