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B4 4-1 平行線性質延伸 等積變換
Author:
AlexWang
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
球体的体积推导（优化版）
球体的体积推导
球體建築師
Discover Resources
二元一次不等式-極大值極小值
MY first GGBBook
立體ㄉ
加法(10一數的副本
桃子Peach
Discover Topics
Upper and Lower Sum or Riemann Sum
Multiplication
Circle
Kite
Sphere