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三角形內心
Author:
Chang Hui Fang
GeoGebra
New Resources
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
【案例】2013年安徽高考15题
Discover Resources
Addition and Subtraction of Polynomials(多項式的加減法)
八芒星
圓錐截橫
invariance interval
三角形的外心
Discover Topics
Kite
Difference and Slope
Upper and Lower Sum or Riemann Sum
Integral Calculus
Exponential Functions