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試證明：A=B+C
Author:
顏士勛
GeoGebra
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球体的体积推导（优化版）
漂亮的摇摆曲线
讀磅
多邊形的面積
祖冲之的期望：内棋与外棋
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Quiz on Factorization of Quadratic Polynomials (Cross Method) 因式分解一元二次多項式(十字相乘法)：測驗
曲線
三角形內角和_2
Trigonometric Identities
旋轉扇形
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Diagrams
Reflection
Perimeter
Geometric Distribution
Median Line