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Author:
李春培
I love you
GeoGebra
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兩組對邊相等的四邊形
算柱 (兩位數)
錐體建築師
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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表示數線上的位置
四連桿(可調)
角平分線製作
太陽系的認識(問答)
Ex.1
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Congruence
Optimization Problems
Rectangle
Similar Triangles
Difference and Slope