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3-1-4
Author:
環遊數界
GeoGebra
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四邊形的特性
拼砌四邊形
畫出對稱圖形
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
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國三2-2習作題
艾雪鑲嵌
線性組合2： 三角形
Shoplifting and theft histogram
勾股定理的直观证明（义务教育数学 新课标-例82）
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Square
Line Segment
Numbers
Confidence Interval
Fractions