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椭圆的光学性质
Author:
孟宝兴
GeoGebra
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兩位數除以一位數（二）
【案例】2013年安徽高考15题
四邊形的特性
兩組對邊相等和有直角的四邊形
畫出對稱圖形
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尺規作圖乾淨版
test
Triangle
餘弦函數 y=Cos(x)
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Logic
Probability
Random Experiments
Exponent
Correlation