如何排版多行公式(自己排版的代码很难看，而且报了一个小错误)

想将这几行公式排好一点，代码写好一点。或者说，我写的其实挺好的，不用修改了(尴尬)

\documentclass{ctexart}
\usepackage{amsmath}
\begin{document}
![86b385c78ee061b3784b003cf6f5c083.png](https://pics.latexstudio.net/uploads/20210428/86b385c78ee061b3784b003cf6f5c083.png)

\begin{align*}
    \begin{bmatrix}
        1 &x_{1} \\
        1 &x_{2} \\
        1 &x_{3} \\
        1 &x_{4} \\
        1 &x_{5}
    \end{bmatrix}
    \begin{bmatrix}
        a \\
        b
    \end{bmatrix}
    &=
    \begin{bmatrix}
        1/y_{1}^{2} \\
        1/y_{2}^{2} \\
        1/y_{3}^{2} \\
        1/y_{4}^{2} \\
        1/y_{5}^{2}
    \end{bmatrix}
    \intertext{\Rightarrow}
    \begin{bmatrix}
        1 &1 &1 &1 &1 \\
        x_{1} &x_{2} &x_{3} &x_{4} &x_{5}
    \end{bmatrix}
    \begin{bmatrix}
        1 &x_{1} \\
        1 &x_{2} \\
        1 &x_{3} \\
        1 &x_{4} \\
        1 &x_{5}
    \end{bmatrix}
    \begin{bmatrix}
        a \\
        b
    \end{bmatrix}
    &=
    \begin{bmatrix}
        1 &1 &1 &1 &1 \\
        x_{1} &x_{2} &x_{3} &x_{4} &x_{5}
    \end{bmatrix}
    \begin{bmatrix}
        1/y_{1}^{2} \\
        1/y_{2}^{2} \\
        1/y_{3}^{2} \\
        1/y_{4}^{2} \\
        1/y_{5}^{2}
    \end{bmatrix}
    \intertext{\Rightarrow}
    \begin{bmatrix}
        5  &\sum_{i=1}^{5}x_{i} \\
        \sum_{i=1}^{5}x_{i} &\sum_{i=1}^{5}x_{i}^{2}
    \end{bmatrix}
    \begin{bmatrix}
        a \\
        b
    \end{bmatrix}
    &=
    \begin{bmatrix}
        \sum_{i=1}^{5}\frac{1}{y_{i}^{2}} \\
        \sum_{i=1}^{5}\frac{x_{i}}{y_{i}^{2}}
    \end{bmatrix}
    \intertext{\Rightarrow}
    \begin{bmatrix}
        5a + b\sum_{i=1}^{5}x_{i} \\
        a\sum_{i=1}^{5}x_{i} + b\sum_{i=1}^{5}x_{i}^{2}
    \end{bmatrix}
    &=
    \begin{bmatrix}
        \sum_{i=1}^{5}\frac{1}{y_{i}^{2}} \\
        \sum_{i=1}^{5}\frac{x_{i}}{y_{i}^{2}}
    \end{bmatrix}
\end{align*}
\end{document}

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