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畢氏定理完成20170330final
Author:
許志昌
GeoGebra
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異分母分數減法
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
小数 的副本
兩位數除以一位數（二）
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空間中兩向量夾角
Area of triangle with different base
千年曆
軌跡觀察---三圓上三角形重心
滾球平台
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Rhombus
Rectangle
Reflection
Diagrams
Cosine