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1989全国文13
Author:
常振虎
GeoGebra
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兩組對邊相等的四邊形
Claude 解幾何題
近似值：有效數字
sanjiaohanshu
Nested spiral octagon
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分形几何欣赏初步：树型图
題A至E
SIN繪圖
剪刀石頭布
分物活動 1
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Sphere
Standard Deviation
Triangles
Linear Regression
Angles