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面積2轉正三角形
Author:
囧囧丸
GeoGebra
New Resources
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
兩位數除以一位數（一）
算柱 (兩位數)
兩組對邊相等的四邊形
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