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结论为e²-1的第3种情况
Author:
老魏实验室
GeoGebra
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畫出對稱圖形
算柱 (兩位數)
球體建築師
近似值：有效數字
找出對稱軸
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三角形外角和為360度
Angle between Two Planes 面面角
面積1轉正三角形
曲线
时钟（序列文本）
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Equations
Right Triangles
Tangent Function
Linear Programming or Linear Optimization
Scalene Triangles