答案1
这个布局怎么样?
\documentclass[11pt]{article}
\usepackage{mathtools}
\begin{document}
\begin{gather*}
x^2(x-1) = 0 \\[2ex]
\begin{alignedat}{2}
& & (x^2 = 0) & \vee (x-1 = 0) \\
\ArrowBetweenLines
& & (x = 0) & \vee (x =1)
\end{alignedat}
\end{gather*}%\\
\end{document}
编辑:
另一种布局,希望更符合您的要求(相同的序言):
\begin{alignat*}{2}
& & \mathllap{x^2(x-1)} & = 0 \\[1ex]
(x^2 & = 0) \vee{} & (x-1 & = 0) \\
(x & = 0) \vee{} & (x & =1)
\end{alignat*}
答案2
那这个呢?
\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
x^2(x-1)=0 \Rightarrow \begin{cases} x^2=0 &\Rightarrow x=0\\ x-1=0 &\Rightarrow x=1\end{cases}
\]
\end{document}
更新array
:
\documentclass{article}
\usepackage{amsmath, array}
\begin{document}
\[
\begin{array}{@{}r@{\ }l@{\ }l@{}}
\multicolumn{2}{r}{x^2(x-1)}&=0\\
x^2=0\ \vee &x-1&=0 \\
x=0\ \vee &x &=1
\end{array}
\]
\end{document}