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GeoGebra
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兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
柱體建築師
兩位數加法
四邊形的特性
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習題1.1 (P16) _ 2016.10.02
中垂線性質
congruent activity
柱體的橫截面
与椭圆焦点三角形外角平分线有关的轨迹.许兴华数学
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Perimeter
Triangles
Boxplot
Confidence Interval
Normal Distribution