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平移旋轉對稱
Author:
chen mingchuan
GeoGebra
New Resources
四邊形的特性
画直线等分三角形的面积
第八周作业
兩組對邊相等的四邊形
球体的体积推导（优化版）
Discover Resources
vector
平面直角坐标系
概率与频率关系
二重积分
Circle
Discover Topics
Stochastic Process or Random Process
Straight Lines
Vectors
Square
Equations