389. LaTeX技巧269：带颜色多行公式的输入技巧

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效果图：






演示代码：
\documentclass{article}
\usepackage{amsmath}
\usepackage{empheq}
\usepackage{xcolor}
\usepackage{graphicx}
\definecolor{hellmagenta}{rgb}{1,0.75,0.9}
\definecolor{hellcyan}{rgb}{0.75,1,0.9}
\definecolor{hellgelb}{rgb}{1,1,0.8}
\definecolor{colKeys}{rgb}{0,0,1}
\definecolor{colIdentifier}{rgb}{0,0,0}
\definecolor{colComments}{rgb}{1,0,0}
\definecolor{colString}{rgb}{0,0.5,0}
\definecolor{darkyellow}{rgb}{1,0.9,0}
\begin{document}
\def\xstrut{\vphantom{\dfrac{(A)^1}{(B)^1}}}
\begin{equation}\label{eq:6}
E = %
\colorbox{darkyellow}{$\xstrut a_vA$} -
\colorbox{hellmagenta}{$\xstrut a_fA^{2/3}$} -
\colorbox{green}{$\xstrut a_c\dfrac{Z(Z-1)}{A^{1/3}}$} -
\colorbox{cyan}{$\xstrut a_s\dfrac{(A-2Z)^2}{A}$} +
\colorbox{yellow}{$\xstrut E_p$}
\end{equation}
\[\color{magenta}
\left(\prod^n_{\, j=1}\hat{x}_j\right)H_c=%
\frac{1}{2}\hat{k}_{ij}\det\widehat{\mathbf{K}}(i|i)
\]

\colorbox{hellmagenta}{%
\parbox{\linewidth-2\fboxsep}{%
\begin{align}\label{eq:3}
\frac{I(\alpha )}{I_{0}}=%
\begin{cases}
\sqrt{1-\frac{\alpha}{\pi}+\frac{1}{2\pi}\sin 2\alpha}
& \varphi =0\\[0.4cm]
\sqrt{2\left(1-\frac{\alpha}{\pi}\right)%
\left(2+\cos 2\alpha \right)+\frac{3}{\pi}\sin 2\alpha}
& \varphi =\frac{\pi}{2}
\end{cases}
\end{align}%
}}

\begin{empheq}[box=\fcolorbox{blue}{hellcyan}]{align*}
x(t) & =\frac{a\left(t^{2}-1\right)}{t^2+1}\\
y(t) & =\frac{at\left(t^{2}-1\right)}{t^2+1}
\end{empheq}


\begin{align}\label{eq:pqFormel}
y &= 2x^2 -3x +5\\\nonumber
& \hphantom{= \ 2\left(x^2-\frac{3}{2}\,x\right. }%
\textcolor{blue}{%
\overbrace{\hphantom{+\left(\frac{3}{4}\right)^2- %
\left(\frac{3}{4}\right)^2}}^{=0}}\\[-11pt]
&= 2\left(\textcolor{red}{%
\underbrace{%
x^2-\frac{3}{2}\,x + \left(\frac{3}{4}\right)^2}%
}%
\underbrace{%
- \left(\frac{3}{4}\right)^2 + \frac{5}{2}}%
\right)\\
&= 2\left(\qquad\textcolor{red}{\left(x-\frac{3}{4}\right)^2}
\qquad + \ \frac{31}{16}\qquad\right)\\
y\textcolor{blue}{-\frac{31}{8}}
&= 2\left(x\textcolor{cyan}{-\frac{3}{4}}\right)^2%
\end{align}

\end{document}