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二次函數
Author:
handsousou
GeoGebra
New Resources
找出對稱軸
球体的体积推导（优化版）
画直线等分三角形的面积
拼砌四邊形
兩組對邊相等和有直角的四邊形
Discover Resources
梯形的面積
三個外切圓
兩圓動點中點軌跡
同位角---不平行綫
心脏线切线族
Discover Topics
Polynomial Functions
Root
Normal Distribution
Pie Chart or Circle Chart
Median Value