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3d正十二面體
Author:
莊宗達
GeoGebra
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球体的体积推导
拼砌四邊形
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（一）
画直线等分三角形的面积
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物體的體積
locus wrt two pts on two indep. circle
test
江苏省职校数学网络资源
圓周_心算題02
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Right Triangles
Limits
Parabola
Rotation
Angles