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弓形塗顏色
Author:
炫哥
GeoGebra
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拼砌四邊形
画直线等分三角形的面积
錐體建築師
三位數除以一位數（二）
異分母分數減法
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真分數相乘
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夾擠單位圓的面積
跳動的愛心－平面
淘宝网
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Derivative
Rhombus
Geometry
Kite
Fractions