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将三角形面积一分为二
Author:
谢鹏
GeoGebra
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【案例】2018年全国1卷理科12题
常见四边形是否是双心四边形
探究三角形的全等條件
垂直線的斜率
直線的斜率：水平變化 & 鉛垂變化
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n星角
angles sum of a triangle 1
Distributive Law of Multiplication 1 (乘法的分配率 1)
hihihi
橢圓2--四圓心近似法
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Equilateral Triangles
Hypothesis Testing
Division
Tree Diagrams
Ellipse