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17第24题
Author:
袁正铎
GeoGebra
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四邉形 (四年級) 教師版
Earth with coastline
算柱 (兩位數)
sanjiaohanshu
Claude 解幾何題
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拿破侖定理(內拿破侖)證明三
與三半圓相切的圓
軌跡觀察---兩圓上線段中點
玖数小学数学（思维拓展）
两个等腰三角形
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Trapezoid
Equations
Quadrilaterals
Addition
Algebra