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第三冊2-2練習18
Author:
陳柄何
GeoGebra
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双心四边形
盈利與虧蝕
常见四边形是否是双心四边形
活动三：应用性质
异形操场
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proof ASA
正五角錐
zentangle
襯墊
根據百分率找數量（二）: 例4的副本
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Equations
Normal Distribution
Trigonometric Functions
Binomial Distribution
Trigonometry