![如何将两个方程组并列放置?](https://linux22.com/image/403318/%E5%A6%82%E4%BD%95%E5%B0%86%E4%B8%A4%E4%B8%AA%E6%96%B9%E7%A8%8B%E7%BB%84%E5%B9%B6%E5%88%97%E6%94%BE%E7%BD%AE%EF%BC%9F.png)
标题说明了一切。我试过了
\begin{alignat*}
& \begin{aligned} & \begin{cases}
m \Ddot{x} = m g \cdot sen(\theta) - F_r \\
m \Ddot{y} = m g \cdot cos(\theta) - N = 0 \\
I \Ddot{\phi} = \sum \tau = \Vec{R} \times \Vec{F_r}
\end{cases}\\
\MoveEqDown
\end{aligned}
\Rightarrow
\begin{aligned}
& \begin{cases}
\vspace{1mm}
m \Ddot{x} = m g \cdot sen(\theta) - \mu \cdot m g \cdot cos(\theta) \\
m \Ddot{y} = m g \cdot cos(\theta) - N = 0 \\
I \Ddot{\phi} = R \cdot \mu \cdot mg \cdot cos(\theta) \cdot sen(\alpha)
\end{cases} \\
\MoveEqLeft[-1]
\end{aligned}
\end{alignat*}
它显示的内容与发布的图片类似。那个箭头太烦人了,一定有更简单的方法吗?
答案1
这是您想要实现的吗?您必须嵌套aligned
,cases
而不是相反。外层alignat
是不必要的。
\documentclass{article}
\usepackage{mathtools}
\begin{document}
\[ \begin{cases}
\begin{aligned}
m \Ddot{x} & = m g \cdot \sin(\theta) - F_r, \\
m \Ddot{y} & = m g \cdot \cos(\theta) - N = 0, \\
I \Ddot{\phi} & = \sum \tau = \vec{R} \times \Vec{F_r}
\end{aligned}
\end{cases}
\implies\enspace
\begin{cases}
\begin{aligned}
m \Ddot{x} & = m g \cdot \sin(\theta) - \mu \cdot m g \cdot \cos(\theta), \\
m \Ddot{y} & = m g \cdot \cos(\theta) - N = 0, \\
I \Ddot{\phi} & = R \cdot \mu \cdot mg \cdot \cos(\theta) \cdot \sin(\alpha)
\end{aligned}
\end{cases} \]%
\end{document}