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減法
Author:
陳冠彰
Topic:
Subtraction
義守財數101級製作
GeoGebra
New Resources
柱體建築師
sanjiaohanshu
三位數除以一位數（一）
四邉形 (四年級) 教師版
異分母分數減法
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RECTANGLE
七巧板
Tangent to a curve at a point
繡曲線
四邊形的特性
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Rhombus
Trapezoid
Equilateral Triangles
Boxplot
Differential Calculus