我该怎么写4°
?当我使用align*
或任何其他环境时,方程式会居中,我希望它们都像图片上一样在一条细线上。
以下是我尝试过的:
$(i)$ $\Delta^m(\Delta^n x(t))=\Delta^n(\Delta^m x(t))=\Delta^{n+m}x(t)$\\
$(ii)$ $\Delta(cx(t))=c\Delta x(t)$\\
$(iii)$ $\Delta(x(t)+y(t))=\Delta x(t)+\Delta y(t)$\\
$(iv)$
\begin{align*}
\Delta(x(t)y(t))&= y(t)\Delta x(t)+Ex(t)\Delta y(t)\\
&= x(t)\Delta y(t)+Ey(t)\Delta x(t)\\
&= x(t)\Delta y(t)+y(t)\Delta x(t)+\Delta x(t)\Delta y(t)
\end{align*}\\
$(v)$ $\Delta\left(\dfrac{x(t)}{y(t)}\right)=
\dfrac{y(t)\Delta x(t)- x(t)\Delta y(t)}{y(t)\cdot Ey(t)}$
答案1
我建议您加载(a)enumitem
用于为枚举项创建自定义环境的包和(b)用于在第四个项中amsmath
使用环境的包。aligned
\documentclass{article}
\usepackage{amsmath,enumitem}
\newlist{myenum}{enumerate}{1}
\setlist[myenum]{label*=\upshape\arabic*\textsuperscript{o}}
\begin{document}
\begin{myenum}
\item $\Delta^m(\Delta^n x(t))=\Delta^n(\Delta^m x(t))=\Delta^{n+m}x(t)$
\item $\Delta(cx(t))=c\Delta x(t)$
\item $\Delta(x(t)+y(t))=\Delta x(t)+\Delta y(t)$
\item $\!\begin{aligned}[t]
\Delta(x(t)y(t))&= y(t)\Delta x(t)+Ex(t)\Delta y(t)\\
&= x(t)\Delta y(t)+Ey(t)\Delta x(t)\\
&= x(t)\Delta y(t)+y(t)\Delta x(t)+\Delta x(t)\Delta y(t)
\end{aligned}$
\item $\displaystyle\Delta\left(\dfrac{x(t)}{y(t)}\right)=
\dfrac{y(t)\Delta x(t)- x(t)\Delta y(t)}{y(t)\cdot Ey(t)}$
\end{myenum}
\end{document}