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GeoGebra
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三角函数 的副本
第三周作业效果演示
折扣
第八周作业1
中华人民共和国国旗
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畢氏定理
Quiz on Trigonometric Ratios 辨認三角比：測驗
E-X 电势-X
小学数学
不規則圖形的周界(intro Square)
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Equations
Area
Prism
Function Graph
Inequalities