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ch14 p.30#31
Author:
Ms HCF
GeoGebra
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双心四边形
垂直線的斜率
漂亮的摇摆曲线
球体的体积推导（优化版）
球体的体积推导
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tccs work
光源距離 Light Source Distance
ＡＡＡ與ＳＳＡ不一定全等
Ex5D#6
探究判定全等三角形的条件（SAS）！
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Combinatorics
Solids or 3D Shapes
Cube
Probability
Inequalities