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play tennis
Author:
李春培
play tennis
GeoGebra
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四邉形 (四年級) 教師版
美國國旗 (Codex 版)
算柱 (兩位數)
近似值：有效數字
第八周作业
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橢圓的軌跡
生活中的平面圖形關係─全等
fraction compare
乘法表的自动练习的副本
S3 Ex4.3 Q05(3D圖)
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Subtraction
Symmetry
Numbers
Pie Chart or Circle Chart
Curve Sketching