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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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【案例】2018年全国1卷理科12题
找出對稱軸
判斷球體
兩位數除以一位數（一）
sanjiaohanshu
Discover Resources
牟合方蓋
斯霍滕(Schooten)定理(與角平分線定理等價)
拋物線
多邊形外角和
整式乘法-平方差公式
Discover Topics
Equilateral Triangles
Derivative
Percentages
Similar Triangles
LCM and GCD