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翰林數學_2下_CH3-1_三角形的內角和
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翰林數學
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
柱體建築師
找出對稱軸
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根據百分率找數量（一）: 例2
P6數學
圆面积应用
沪教版练习册7.4第4题
如何平移逼近三点的抛物线
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Trapezoid
Kite
Parametric Curves
Equilateral Triangles
Rhombus