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tan90
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tan90
GeoGebra
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拼砌四邊形
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
【案例】2013年安徽高考15题
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snooker
較複雜的周界問題(二)
三角函數的繪圖2
Copy of 分數比較
a>1, y=Log(a,x) and y=a^x 有可能0,1,2交點!? 的複本
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Numbers
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