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圓相切
Author:
一路梁
圓相切
GeoGebra
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三位數除以一位數（一）
兩組對邊相等的四邊形
算柱 (兩位數)
異分母分數減法
畫出對稱圖形
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圓的基本慨念
quadrilaterals 1
三角形三邊上各一點最小周長
正弦定理
我的第一个绘本
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Dilation
Stochastic Process or Random Process
Cuboid
Sphere
Kite