Order in the presentation

I am giving a presentation and I would like to make the slides in the following order:

The commands are:

documentclass{beamer}
usepackage{tikz}
usetikzlibrary{arrows.meta}
newcommandmyarrow{%
  tikzdraw[red,dashed,thick,-Triangle] (0,0) -- ++(0,-1.1);
}
begin{document}
begin{frame}
$begin{array}{cccccc}
 & f(x) & = & sqrt{x^2 + 500^2} cdot 640,00 & + &  (2000 - x) cdot 312,00 
  &  &  &  &  &  
   &  &  & myarrow &  & myarrow 
 &  &  &  &  &   
Rightarrow & f'(x) & = & 640,00frac{1}{2sqrt{x^2 + 500^2}}2x & + & 312,00(-1) 
end{array} $
end{frame}
end{document}

I know the pause command, but I don’t think it works in this case, because the second arrow is before the text that needs to appear on the last line.

documentclass{beamer}
usepackage{tikz}
usetikzlibrary{arrows.meta}
newcommandmyarrow{%
  tikzdraw[red,dashed,thick,-Triangle] (0,0) -- ++(0,-1.1);
}
begin{document}
begin{frame}

$begin{array}{cccccc}
 & onslide<1->{f(x) & = & sqrt{x^2 + 500^2} cdot 640,00 & + &  (2000 - x) cdot 312,00}
 &  &  &  &  &  
   &  &  & onslide<2->{myarrow} &  & onslide<3->{myarrow} 
 &  &  &  &  &   
onslide<2->{Rightarrow & f'(x) & = & 640,00frac{1}{2sqrt{x^2 + 500^2}}2x} & onslide<3->{+ & 312,00(-1) }
end{array} $
end{frame}
end{document}