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几何体
Author:
DongHai Zhang
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GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
異分母分數減法
判斷球體
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車線.ggb
Apollonius Problem gergonne 1
威畢特點
绝对值加减的图像
賺賠：例2的副本
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Calculus
Numbers
Exponent
Definite Integral
Congruence