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Is it a condition for //gram?
Author:
johnmayhk
GeoGebra
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拼砌四邊形
GeoGebra笔记功能体验课件
【案例】2018年全国1卷理科12题
直角坐標平面上的旋轉變換
三位數除以一位數（一）
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和差角公式几何证明
Multiplication of Polynomials(多項式的乘法)
數學傳播39卷4期, 平面幾何公式思考
光的反射
一线三等角模型
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Symmetry
Right Triangles
Prism
Parabola
Matrices