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dragon(龙)
Author:
赵林
GeoGebra
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sanjiaohanshu
美國國旗 (Codex 版)
算柱 (兩位數)
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
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Properties of Inequalities 不等式的加法與乘法性質
Copy of 閱讀鐘面及數字鐘（時和分）
旋轉的副本
多邊形的切割與拼砌的副本
平方差公式的几何意义
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Random Experiments
Median Line
Statistics
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