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LaTex 中的对齐问题

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LaTex 中的对齐问题

我刚刚开始使用 LaTeX，遇到了一点错误。以下是文档：

\documentclass{article}
%preamble%

\usepackage{amsmath}

\title{An Introduction to Functions and their Derivatives}
\author{Purple Bat}
\date{September 4th, 2018}

\begin{document}

\maketitle

\newpage

\section{Functions}
In mathematics, a function is often described as \(f(x)\) or \(g(x)\), where \(x\) is the input value.

For example: \[f(x) = x+2\]
\[g(x) = x\]

By assigning a value to x, we can plug it into the function, and come up with a value. Hence,

\[f(x) = x+2,\ x=3\]

Thus, by plugging the x-value into the function, we get:
\[f(3)=3+2\]
Thus,

\begin{align*}

&=3+2\\

%

&=5

\end{align*}

By plugging in the same x-value for \(g(x)\), we get:
\[g(3)=3\]

There is a third function, \(h(x)\), which can be defined by \[\frac{f(x)}{g(x)}\]
Utilizing the previously defined functions \(f(x)\) and \(g(x)\), we can define \(h(x)\) as:

\begin{align*}

\(h(x)\)=\frac{f(x)}{g(x)}\\

%

 &= \frac{x+2}{3}

%

\end{align*}



\end{document}

现在，奇怪的是：第一组对齐的方程式编译没有问题。第二组我遇到了错误。除了添加注释中断（为了便于阅读）外，两个对齐都相同。那么为什么第一个可以编译而第二个不能呢？

答案1

欢迎来到 TeX.SX！

%正如 Phelype Oleinik 在评论中所说的那样：如果不至少添加一个来注释掉它，方程式中就不能有空行。

我修改了你的代码如下：

\documentclass{article}
%preamble%

\usepackage{amsmath}

\title{An Introduction to Functions and their Derivatives}
\author{Purple Bat}
\date{September 4th, 2018}

\begin{document}

\section{Functions}
In mathematics, a function is often described as \(f(x)\) or \(g(x)\), where \(x\) is the input value.
For example: 
\begin{gather*}
    f(x) = x+2\\
    g(x) = x
\end{gather*}
%
By assigning a value to x, we can plug it into the function, and come up with a value. Hence,
    \[f(x) = x+2,\ x=3\]
%
Thus, by plugging the x-value into the function, we get:
    \[f(3)=3+2 = 5\]
%
By plugging in the same x-value for \(g(x)\), we get:
    \[g(3)=3\]
%
There is a third function, \(h(x)\), which can be defined by \[\frac{f(x)}{g(x)}\]
Utilizing the previously defined functions \(f(x)\) and \(g(x)\), we can define \(h(x)\) as:
%
\begin{align*}
    h(x)&=\frac{f(x)}{g(x)}\\
    &= \frac{x+2}{x}
\end{align*}

\end{document}

在align*环境中，您使用一次“列分隔符” &（在第二个“行”中）。为了让 LaTeX 知道应该对齐什么，您还必须在第一行添加一个。

我想添加其他内容：通过用空行分隔每行文本，您将获得非常丑陋的外观（由于每个新段落的缩进！）这就是我添加的原因%！

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