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同心圓
Author:
許清惟
GeoGebra
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畫出對稱圖形
兩組對邊相等的四邊形
四邊形的特性
兩位數除以一位數（二）
拼砌四邊形
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軌跡觀察---三圓上三角形重心
Compare areas by cutting shapes Q3
空間旋轉矩陣
sin,cos比大小
翰林數學_2下_CH3-1_三角形的外角和
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Multiplication
Rhombus
Arithmetic Operations
General Quadrilateral
Power Functions