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認識假分數
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lkkbmaths teachers 檔案儲存用
GeoGebra
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球体的体积推导
兩位數除以一位數（二）
三位數除以一位數（二）
兩組對邊相等的四邊形
異分母分數減法
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正四面體作業
波的干涉 Wave Interference
正三角形
橢圓規Ellipsograph (Trammel of Archimedes)
椭圆中的对称斜率为定值问题20190917
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Distributions
Trapezoid
Hyperbola
Sine
Logarithm