...3613396.png](https://img.learnblockchain.cn/attachments/2025/05/JK5HcemQ682fc592967f2.png)
### 一、确定 x, y 与 L, P 的关系
#### 推导 X
$$
\begin{align*}
x \cdot y = k = L^2 \\
(Xr + Xv) \cdot (Yr + Yv) = k \\
p = \frac{y}{x} \\
x = \frac{L^2}{y} = \frac{L^2}{px} \\
x^2 = \...