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正弦型函数
Author:
lzp80
GeoGebra
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【案例】2013年安徽高考15题
三位數除以一位數（二）
四邉形 (四年級) 教師版
第八周作业
柱體建築師
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Angles between 2 planes
Quiz on Angle between a Line and a Plane 線面角：測驗
parallelogram and squares
橢圓軌跡
展開圖
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Rhombus
Probability
Quadratic Equations
Matrices
Piecewise Functions