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定周长的正多边形面积变化规律
Author:
张英华
Topic:
Area
GeoGebra
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拼砌四邊形
畫出對稱圖形
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
算柱 (兩位數)
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商高定理\水2
南女校徽外型
Transit of Venus - Pentagram
频率分布直方图与箱线图
割补法
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Random Variables
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