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Author:
chen mingchuan
GeoGebra
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四邊形的特性
兩位數加法
拼砌四邊形
兩組對邊相等和有直角的四邊形
小数 的副本
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扇形滾動2
題6
sinα + sinβ > 0 ?
傅立葉
完全图
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Square
Numbers
Differential Calculus
Logic
Scatter Plot