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raya81901
GeoGebra
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【案例】2013年安徽高考15题
四邉形 (四年級) 教師版
兩位數除以一位數（一）
四邊形的特性
球体的体积推导（优化版）
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winter vacation homework 12
ggb-fs-a1
SIN繪圖
任意三角形
Parabola_Vertical
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Parallelogram
Integers
Linear Regression
Means
Coordinates