Ykhjuy

I would like to write a formula (see the picture), how can i fix the arrows?

This is my code:

documentclass[a4paper,12pt]{article}[12pt] 

usepackage[italian]{babel} 

usepackage[T1]{fontenc} 

usepackage[utf8]{inputenc} 

usepackage{anysize}

usepackage{graphicx}

usepackage{amsmath}

usepackage{amssymb}

usepackage{mathrsfs} 

usepackage{textcomp} 

linespread{1.5}



frenchspacing 



newcommand{abs}[1]{lvert#1rvert}



usepackage{floatflt,epsfig}



usepackage{multicol}









usepackage[a4paper,top=1.0cm,bottom=1.0cm,left=1.0cm,right=1.0cm]{geometry}





begin{document}





$ dfrac{a pm b}{c} = rightarrow  $



$ dfrac{a+b}{c} $



$ dfrac{a-b}{c} $









end{document}

My version with tikz-cd.

documentclass[a4paper,12pt]{article}

usepackage{tikz-cd}

usepackage{amsmath}



begin{document}

begin{tikzcd}[cells={nodes={minimum height=0cm,minimum width=1.5cm}},column sep=3em,row sep=-3pt]

 & dfrac{a+b}{c}  \

dfrac{a pm b}{c} = arrow[ru] arrow[rd] &  \

 & dfrac{a-b}{c} 

end{tikzcd}

end{document}

Here is an adapted version from Claudio Fiandrino's answer to Joining parts of equations with lines or arrows using tikz.

documentclass{article}

usepackage{tikz}

usepackage{amsmath}



begin{document}



begin{tikzpicture}[grow=right, 

                    sibling distance=50pt,

                    level distance=2cm,

                    edge from parent path={(tikzparentnode.east) -- (tikzchildnode.west)},

                    edge from parent/.style={draw,-latex}]

    node {$ dfrac{a pm b}{c} =$}

    child {node {$ dfrac{a-b}{c} $}}

    child {node {$ dfrac{a+b}{c} $}}

    ;

end{tikzpicture}

end{document}

Without using a hammersledge to crack a nut, you already have the necessary packages for thee below code.

Unrelated: epsfigure and anysize are obsolete. The functionalities of the former are achieved with graphicx and the latter can be replaced with geometry (which you use, anyway).

documentclass[a4paper, 12pt]{article}

usepackage[italian]{babel}

usepackage[T1]{fontenc}

usepackage[utf8]{inputenc}

usepackage[a4paper, margin=1.0cm]{geometry}

usepackage{graphicx}

usepackage{amsmath}

usepackage{amssymb}

usepackage{multicol}

linespread{1.5}

frenchspacing



usepackage{old-arrows}



begin{document}





[ dfrac{a pm b}{c} =

begin{matrix}

nearrow \[-1.5ex] searrow

end{matrix}

:

begin{matrix}

 dfrac{a+b}{c} \[3ex]

 dfrac{a-b}{c}

end{matrix} ]



end{document}