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段落在 \align 完成前結束

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段落在 \align 完成前結束 
\documentclass{article}

\usepackage{amsmath}
\usepackage{fancyhdr}
\usepackage{amssymb}
\pagestyle{fancy}

\rhead{Homework for Stats Chapter 4\textbackslash Lab}

\cfoot{Page \thepage}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\begin{document}
\section{4.4 Excercises}
\begin{enumerate}
    \item For each experiment, list the sample space and the probabilities
          for each outcome. Compute the expected number of heads in each case.
    \begin{enumerate}
        \item Two independent tosses of a fair coin\\
        \{(HH),(HT),(TH),(TT)\}\\
        $\mathbb{P}(HH)=\frac{1}{4} \mathbb{P}(HT)
                =\frac{1}{4}\mathbb{P}(TH)=\frac{1}{4}\mathbb{P}(TT)
                =\frac{1}{4}$\\

        \begin{align}
        \mathbb{E}\left ( H\right )=\sum _{i=0}H_i\cdot p_i & =2\cdot\frac{1}{4}+1\cdot\frac{1}{4}+1\cdot\frac{1}{4}+0\cdot\frac{1}{4}\\
        & =\frac{1}{2}+\frac{1}{4}+\frac{1}{4}\\
        & =1\\

        \end{align}
\end{enumerate}
\end{enumerate}

\end{document}

看不出我哪裡搞砸了。我已經關閉了所有的東西。取得「段落在 \align 完成之前結束。

答案1

您的對齊環境中有一個空白行。我對您的程式碼做了一些修改：將內聯\frac（在我看來太小）替換為包\mfrac中的（=中等大小的分數，約80％的顯示樣式分數）nccmath，刪除了另一個空白行，並且我認為您的每一行對齊不需要編號，我冒昧地將其替換為aligned嵌套在equation.

\documentclass{article}

\usepackage{amsmath}
\usepackage{fancyhdr}
\usepackage{amssymb}
\usepackage{nccmath}
\pagestyle{fancy}
\fancyhf{}
\rhead{Homework for Stats Chapter 4\textbackslash Lab}

\cfoot{Page \thepage}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\begin{document}

\section{4.4 Exercises}
\begin{enumerate}
 \item For each experiment, list the sample space and the probabilities
          for each outcome. Compute the expected number of heads in each case.
 \begin{enumerate}
 \item Two independent tosses of a fair coin\\
        \{(HH),(HT),(TH),(TT)\}\\
        $\mathbb{P}(HH)=\mfrac{1}{4} \mathbb{P}(HT)
                =\mfrac{1}{4}\mathbb{P}(TH)=\mfrac{1}{4}\mathbb{P}(TT)
                =\mfrac{1}{4}$

        \begin{equation}
        \begin{aligned}
        \mathbb{E}\left ( H\right )=∑ _{i=0}^4H_i · p_i & =2 · \frac{1}{4}+1 · \frac{1}{4}+1 · \frac{1}{4}+0 · \frac{1}{4}\\
        & =\frac{1}{2}+\frac{1}{4}+\frac{1}{4}\\
        & =1
        \end{aligned}
        \end{equation}
\end{enumerate}
\end{enumerate}
\end{document}

在此輸入影像描述

答案2

我認為您不應該在環境中的最後一行末尾有換行符。嘗試刪除最後一個\\.

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