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Author:
Kelvin
GeoGebra
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直角坐標平面上的旋轉變換
四邊形的特性
四邉形 (四年級) 教師版
三位數除以一位數(一)
異分母分數減法
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chuan-eBook
圓錐展開圖
滾球平台
多点联动
剪切成正三棱柱(制作:李三军,修订:孟宝兴)
Discover Topics
Parallelogram
Planes
Logic
General Quadrilateral
Integral Calculus