阵列和对齐

Question

我正在尝试显示数组中的值列表。顶行没问题，但当我添加另一个值时，一切都乱了套。我该如何解决这个问题？基本上，我希望所有值都等距分布，并且任何不适合同一行的值都以相同的对齐方式放在下一行。谢谢！

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{parskip} 

\begin{document}

    \centerline{Question 2}

$x = \begin{array}{ccc}
    -1.5  & -0.5 &  -0.804163391778384
\end{array}$

iteration = 

\hspace{8mm}1

$x = \begin{array}{ccc}
-1.5  & -0.5 &  -0.804163391778384 
\\-0.805017312865838
\end{array}$

iteration = 
\hspace{8mm}2



\end{document}

Answer 1

不清楚你喜欢什么。我怀疑你正在寻找以下内容：

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{parskip}

\begin{document}

    \centerline{Question 2}

$x = \begin{array}{ccc}
    -1.5  & -0.5 &  -0.804163391778384
\end{array}$

iteration = 

\hspace{8mm}1

$x = \begin{array}[t]{ccc}
-1.5  & -0.5 &  -0.804163391778384  \\
-0.805017312865838  &   &
\end{array}$

iteration =

\hspace{8mm}2
\end{document}

或者您可能希望拥有以下内容：

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{parskip}

\begin{document}

    \centerline{Question 2}

$x = -1.5 - 0.5 - 0.804163391778384$

iteration \hspace{8mm}1:

$\begin{aligned}
x & = -1.5 - 0.5 - 0.804163391778384  \\
  & = -0.805017312865838
\end{aligned}$

iteration \hspace{8mm}2:
\end{document}

根据您添加的有关信息，您似乎希望拥有：

\documentclass[a4paper,12pt]{article}
\usepackage{amsmath}
\usepackage{array}

\begin{document}

    \centerline{Question 2}

$x = \begin{array}{@{} *{3}{>{$}p{9em}<{$}} }
    -1.5  & -0.5 &  -0.804163391778384
    \end{array}$

iteration = \hspace{8mm}1

$x = \begin{array}[t]{@{} *{3}{>{$}p{9em}<{$}} }
    -1.5  & -0.5 &  -0.804163391778384  \\
    -0.805017312865838  &   &
\end{array}$

iteration = \hspace{8mm}2
\end{document}