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Li Shan Lan Cone Pi
Author:
tkyggb
GeoGebra
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兩位數除以一位數（二）
拼砌四邊形
三位數除以一位數（一）
【案例】2018年全国1卷理科12题
兩組對邊相等的四邊形
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Is this a prism 2
gdss
指數圖形
kkklkl
Protractor-usage