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對摺平行四邊形
Author:
hingchan
GeoGebra
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【案例】2013年安徽高考15题
兩組對邊相等和有直角的四邊形
異分母分數減法
四邉形 (四年級) 教師版
三位數除以一位數（一）
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平移
fixed arc length and fixed shaded area
Question 3
星星
描点法画函数图像
Discover Topics
Rational Numbers
Histogram
Median Value
Sine
Unit Circle