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将三角形面积一分为二
Author:
谢鹏
GeoGebra
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三位數除以一位數（一）
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
兩位數加法
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部分佔全部的百分率 :例2
Area of polygon
gjh-g01-01 單項乘以兩項差
習作A三ch1_11
四邊形層疊
Discover Topics
Geometric Transformations
Square
Standard Deviation
Pythagoras or Pythagorean Theorem
Geometric Distribution