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半圆的滚动
Author:
孟宝兴
GeoGebra
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三位數除以一位數（二）
兩組對邊相等的四邊形
画直线等分三角形的面积
畫出對稱圖形
找出對稱軸
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Measurement & Classification of Angles 角的量度和分類
爱心
拋物線6-包絡線法
微信公众号“sx880A8”第706期中非国旗（Central African Republic）
三個正圓柱體交集體積(數資)
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Quadrilaterals
Matrices
Median Line
Constructions
Normal Distribution