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利用对称求线段和最值（移动端）
Author:
梁航宇
GeoGebra
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兩組對邊相等的四邊形
sanjiaohanshu
拼砌四邊形
畫出對稱圖形
近似值：有效數字
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cos, sin 與單位圓
優良作品2(季緯)
Locus (Segment)
二次函數
平面截圆锥
Discover Topics
Arithmetic Mean
Trigonometry
Hypergeometric Distribution
Conditional Probability
Geometry