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陳隆期
GeoGebra
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畫出對稱圖形
四邊形的特性
拼砌四邊形
球體建築師
兩位數除以一位數（二）
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try_111
省政信箱
task4
圆的面积 - 洋葱法
椭圆的定义
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Real Numbers
Polynomial Functions
Quadratic Equations
LCM and GCD
Rational Numbers