Markdown 语法

$$f(x) = \begin{cases}
x_1 = x_{1,0} + \frac{a_2}{(a_1,a_2)}\times t\\
{x_2 = x_{2,0} - \frac{a_1}{(a_1,a_2)}\times t}
\end{cases}$$

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$$f(x) = \begin{cases}
x_1 = x_{1,0} + \frac{a_2}{(a_1,a_2)}\times t\\\\
{x_2 = x_{2,0} - \frac{a_1}{(a_1,a_2)}\times t}
\end{cases}$$
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