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光源距離 Light Source Distance
Author:
W.L. Wong, Albert
GeoGebra
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【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
異分母分數減法
球体的体积推导（优化版）
兩組對邊相等的四邊形
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test P1
謝爾賓斯基三角形(Sierpinsky)
P1 1st Maths
gjc093b19 梯形的面積
Copy of 多边形外角和
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Polygons
Multiplication
Continuity
Straight Lines
Solids or 3D Shapes