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习题3c第七题（奇怪的水坝）
Author:
纪露结
GeoGebra
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拼砌四邊形
兩位數除以一位數（二）
四邉形 (四年級) 教師版
判斷球體
球體建築師
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waaachen0001
折扣 例6
讚2
SLOPE
GeoGebra 動畫開關按鈕製作的副本
Discover Topics
Geometric Transformations
Cylinder
Cosine
Complex Numbers
Geometric Mean