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勾股数
Author:
杨秀芬
GeoGebra
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判斷球體
錐體建築師
三位數除以一位數（二）
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
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proof SAS
畫三角形 題4b
gtx-a01-flag-sesel-01 塞席爾國旗
三次函數
Orthographic Views 1
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Mode
Conic Sections
Difference and Slope
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Cone