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平行四邊形教材
Author:
蔡敏蓁
GeoGebra
New Resources
兩位數加法
第八周作业
球体的体积推导
兩位數除以一位數（一）
四邊形的特性
Discover Resources
扣球路徑求直線方程式(隨機出題)
Circle
St. Line
Illusion-内凹的正方形
运动的全等三角形.许兴华数学
Discover Topics
Area
Exponential Functions
Integers
Calculus
Frequency Distribution