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Author:
李政憲
GeoGebra
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四邉形 (四年級) 教師版
球体的体积推导（优化版）
球体的体积推导
柱體建築師
兩組對邊相等的四邊形
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「ASS」
test
Apollonius Problem gergonne 0
Measure of Dispersion
三角函数定积分的动态演示.许兴华数学
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Square
Interest Calculation
Kite
Boxplot
Area