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凉 清
GeoGebra
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画直线等分三角形的面积
球體建築師
兩位數除以一位數（一）
GeoGebra笔记功能体验课件
第八周作业
Discover Resources
waaachen
各種四邊形
Copy of 函數切線及法線
函數平移
全景平面投影
Discover Topics
Trapezoid
Real Numbers
Combinatorics
Means
Sequences and Series