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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
找出對稱軸
球體建築師
三位數除以一位數（一）
異分母分數減法
球体的体积推导（优化版）
Discover Resources
正立方形與兩面角
gjh-g02-00 單項乘以兩項差
Question 2(Angle)
相似而不断变化的正多边形.许兴华数学
求切线方程(改进)
Discover Topics
Pie Chart or Circle Chart
Geometric Mean
Hypothesis Testing
Numbers
Dilation