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ch14 p.30#31
Author:
Ms HCF
GeoGebra
New Resources
四邊形的特性
兩位數除以一位數（一）
錐體建築師
近似值：有效數字
畫出對稱圖形
Discover Resources
畢氏定理
完整地球儀
錐體的橫截面
时钟（序列文本）
平分线段或角
Discover Topics
Rhombus
Differential Equation
Linear Equations
Equilateral Triangles
Straight Lines