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比一比看谁小
Author:
玖数
比一比看谁小
GeoGebra
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盈利與虧蝕
椭圆内切圆链
正方形雪花图案
折扣
异形操场
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GeoGebraBook(for20151202)
二次函數圖形與兩軸的交點
四下_面積(一)(學生版)
橢圓截圓錐
定积分中的二次函数曲边三角形面积.许兴华数学
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Similar Triangles
Rectangle
Tree Diagrams
Angles
Translation