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Author:
陳隆期
GeoGebra
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異分母分數減法
兩位數除以一位數（一）
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
四邊形的特性
Discover Resources
proof SSS
telling the time
move
軌跡觀察---兩軸上的固定長定點軌跡
旋轉指令
Discover Topics
Natural Numbers
Ratios
Upper and Lower Sum or Riemann Sum
Sine
Tangent Line or Tangent