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定长线段在相交直线上滑动
Author:
冯伟冀
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
四邊形的特性
柱體建築師
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判斷錐體 5
testing
二次函數04
Indices 4
數學傳播39卷4期, 平面幾何公式思考
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Parabola
Numbers
Natural Numbers
Vectors 3D (Three-Dimensional)
Terms