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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
錐體建築師
四邉形 (四年級) 教師版
四邊形的特性
【案例】2018年全国1卷理科12题
異分母分數減法
Discover Resources
task 2
Physics
藝術著色的副本
正方形
四邊形的特性
Discover Topics
Sine
Equilateral Triangles
Solids or 3D Shapes
Cylinder
Optimization Problems