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- A \in \mathbb{R}^{n\times n}
- \\
- \\
- A = \begin{bmatrix}
- a & b & ... & b \\
- b & a & ... & b \\
- ... & ... & ... & ... \\
- b & b & ... & a
- \end{bmatrix}
- \\
- \\
- B = A^{-1} =
- \begin{bmatrix}
- x & y & ... & y \\
- y & x & ... & y \\
- ... & ... & ... & ... \\
- y & y & ... & x
- \end{bmatrix}
- \\
- \\
- B\cdot A = E \Rightarrow \\
- \left\{\begin{matrix}
- a\cdot x + (n-1)\cdot b\cdot y = 1\\
- a\cdot y + b\cdot x + (n-2)\cdot b\cdot y = 0
- \end{matrix}\right. \\ \\
- ... \\ \\
- \left\{\begin{matrix}
- y = -\frac{b}{a^2 + (n-2)\cdot a\cdot b - (n-1)\cdot b^2}\\
- x = \frac{a+b}{a^2 + (n-2)\cdot a\cdot b - (n-1)\cdot b^2}
- \end{matrix}\right.
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