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練習－由一元二次方程判別根的數目
Author:
Lau Sir
GeoGebra
New Resources
拼砌四邊形
錐體建築師
兩位數加法
柱體建築師
球体的体积推导（优化版）
Discover Resources
內切圓滾動
龍騰4_1-1課例3
賴桑_等差數列與級數_兩數列之比例
星球運動模擬
三角形
Discover Topics
Planes
Upper and Lower Sum or Riemann Sum
Coordinates
Exponential Functions
Natural Numbers