Latex 公式换行 等号左对齐

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begin{equation}
begin{aligned}
X^TXh - X^TY&= 
begin{bmatrix}
    x_1 & x_2 & ... & x_n\
    1 & 1 & ... & 1
end{bmatrix}
begin{bmatrix}
    x_1 & 1\
    x_2 & 1\
    ... & ...\
    x_n & 1
end{bmatrix}
begin{bmatrix}
    m \
    b \
end{bmatrix} -
begin{bmatrix}
    x_1 & x_2 & ... & x_n\
    1 & 1 & ... & 1
end{bmatrix}
begin{bmatrix}
    y_1 \
    y_2 \
    ... \
    y_n
end{bmatrix} \
&=
begin{bmatrix}
    x_1^2+x_2^2+...+x_n^2 & x_1+x_2+...+x_n \
    x_1+x_2+...+x_n & 1+1+...+1
end{bmatrix}
begin{bmatrix}
    m \
    b \
end{bmatrix} - 
begin{bmatrix}
    x_1y_1+x_2y_2+...+x_ny_n \
    y_1+y_2+...+y_n
end{bmatrix} \
&=
begin{bmatrix}
    m(x_1^2+x_2^2+...+x_n^2) + b(x_1+x_2+...+x_n) \
    m(x_1+x_2+...+x_n) + nb
end{bmatrix} -
begin{bmatrix}
    x_1y_1+x_2y_2+...+x_ny_n \
    y_1+y_2+...+y_n
end{bmatrix} \
&=
begin{bmatrix}
    m(x_1^2+x_2^2+...+x_n^2) + b(x_1+x_2+...+x_n) - (x_1y_1+x_2y_2+...+x_ny_n) \
    m(x_1+x_2+...+x_n) + nb - (y_1+y_2+...+y_n)
end{bmatrix} \
&=
begin{bmatrix}
    displaystyle
    sum_{i=1}^{n}{mx_i^2 + bx_i - x_iy_i} \
    displaystyle
    sum_{i=1}^{n}{mx_i + b - y_i} \
end{bmatrix} \
&= 
begin{bmatrix}
    displaystyle
    sum_{i=1}^{n}{-x_i(y_i - mx_i - b)} \
    displaystyle
    sum_{i=1}^{n}{-(y_i - mx_i - b)} \
end{bmatrix} \
&=
begin{bmatrix}
    frac{partial E}{partial m}\
    frac{partial E}{partial b}
end{bmatrix}
end{aligned}
end{equation}

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begin{equation}
begin{aligned}
   m = frac{1}{2}\
   b = frac{2}{3}
end{aligned}
end{equation}


begin{cases}
displaystyle
m = frac{1}{2} \
\
displaystyle
b = frac{2}{3} \
end{cases}