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play tennis
Author:
李春培
play tennis
GeoGebra
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兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
柱體建築師
兩位數除以一位數（二）
球体的体积推导（优化版）
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優良作品3(祥恩)
reflectional symmetry_1
線的面畫
b站
Regular Tetrahedron
Discover Topics
Probability
Dilation
Conic Sections
Statistics
Limits