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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
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畫出對稱圖形
兩位數除以一位數（一）
球體建築師
算柱 (兩位數)
四邊形的特性
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Slope 斜率 - 概念及定義 (3)
winter vacation homework 9
Angle in Alternate Segment 1
银币
杯麵
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Dilation
Differential Calculus
Tree Diagrams
Solids or 3D Shapes
Angles