滿足下列條件的方程式
當X→0 則Y→∞
當X=1 時Y有最小值t
X >1 則X和Y呈正比
類似這樣的圖形
Y
↑| ╱
│| ╱
│ \ ╱
│ \ ╱
│ \╱
│
┴─────────→X
1
感謝><"
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