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Arithmetic Series 等差級數
Author:
Alex CHIK
GeoGebra
gMath 互動數學教室
http://www.geogebra.hk
New Resources
画直线等分三角形的面积
球体的体积推导（优化版）
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
Discover Resources
proof ASA
TOPVINKEL
根據百分率找數量（二）: 例4
仙后座找北極星1
a sin(bx+c) + d 的圖形的副本
Discover Topics
Solids or 3D Shapes
Means
Geometric Mean
Median Line
Binomial Distribution