```tex documentclass[8pt]{extarticle} usepackage[UTF8]{ctex} usepackage[paperwidth=21cm,paperheight=29.7cm,top=2.4cm,bottom=2.4cm,right=0.78cm,left=1.78cm]{geometry} usepackage{fancyhdr} usepackage{ti...
 begin{center}前后留白怎么会这么大。 ```tex documentclass[twocolumn,landscape,twoside,8pt]{extarticle} usepackage[UTF8]{ctex} usepackage{m...
```tex documentclass[8pt]{extarticle} usepackage[UTF8]{ctex} usepackage[paperwidth=21cm,paperheight=29.7cm,top=2.4cm,bottom=2.4cm,right=0.78cm,left=1.78cm]{geometry} usepackage{fancyhdr} usepackage{ti...
 begin{center}前后留白怎么会这么大。 ```tex documentclass[twocolumn,landscape,twoside,8pt]{extarticle} usepackage[UTF8]{ctex} usepackage{m...
 begin{center}前后留白怎么会这么大。 ```tex documentclass[twocolumn,landscape,twoside,8pt]{extarticle} usepackage[UTF8]{ctex} usepackage{m...
```tex documentclass{article} usepackage[UTF8]{ctex} usepackage{amsmath} begin{document} noindent $Omega = { ( A _ { 1 } , A _ { 2 } ) , ( A _ { 1 } , A _ { 3 } ) , ( A _ { 1 } , B _ { 1 } ) , ( A _ {...
