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Author:
chen mingchuan
GeoGebra
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球体的体积推导（优化版）
拼砌四邊形
【案例】2018年全国1卷理科12题
四邊形的特性
兩位數加法
Discover Resources
门禁系统
reflectional symmetry_3
圓繞圓內外
正20面體展開
漂亮的摇摆曲线
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Differential Calculus
Logic
Difference and Slope
Solids or 3D Shapes
Means