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tao sun
GeoGebra
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拼砌四邊形
算柱 (兩位數)
三位數除以一位數（二）
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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暗棋的步距
soccer
正立方形與兩面角
波的干涉 Wave Interference
for 學姊
Discover Topics
Real Numbers
Surface
Equilateral Triangles
Straight Lines
Reflection