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1988全国文12
Author:
常振虎
GeoGebra
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兩位數加法
【案例】2013年安徽高考15题
第八周作业
三位數除以一位數（二）
四邉形 (四年級) 教師版
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多邊形面積探究1
Angle between Lateral Faces 2
正切函數的絕對值圖形
圆与圆的位置关系
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Arithmetic Mean
General Quadrilateral
Perimeter
Trigonometric Functions
Percentages