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比和比值
Author:
李春培
比和比值
GeoGebra
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三位數除以一位數（一）
球体的体积推导（优化版）
球體建築師
算柱 (兩位數)
兩組對邊相等的四邊形
Discover Resources
少一塊
西姆松定理推廣(西姆松圓)
橢圓軌跡01
tetrahedron_rotation
比較角的大小2
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Terms
Parallelogram
Area
Trapezoid
Planes