How can i do a matrix like this one?

Question

I was asked to type these matrices as they appear, but I don't know how to do that. (I highlighted the problem in red)

I tried so far this:
$ A= begin{pmatrix}
 -4  &  2  & 12 
 2  & -6 &  9  
 8  &  7 & -2
 end{pmatrix}$ hspace{1.1cm} $ A= begin{pmatrix}
 13  &  -21  & 9 & 12
 -9  & 2 &  -8 & -7 
 9  &  -2 & 1 & 7
 end{pmatrix}$ hspace{1.5cm} $ A= begin{pmatrix}
 12  &  11  
 11  & 22    
 8  &  12 
 end{pmatrix}$
 $ A= begin{pmatrix}
 12 &  12  & -2 
 2  & 6 &  -9  
 end{pmatrix}$ hspace{1.3cm} $ A= begin{pmatrix}
 -3  &  2 & 8 & 7
 -4  & 2 &  8 & -7 
 2  & -12 &  11 & 32 
 1  & 5 &  -21 & -12 
 12  & -11 &  6 & 76 
 11  & 12 &  -11 & -29 
 end{pmatrix}$ hspace{1.1cm} $ A= begin{pmatrix}
 12  &  7 & 2 & 12  
 7  & -4 & 2 & -6 
 7  &  -9 & 12 & -8
 end{pmatrix}$
 $ A= begin{pmatrix}
 11 &  9  & 13 
 12  & -2 &  21  
 end{pmatrix}$ hspace{7.3cm}  $ A= begin{pmatrix}
 -12  &  21 & -34 & -23  
 13  & -21 & 15 & 21 
 -43  &  16 & 32 & -19
 end{pmatrix}$

And this was where I get.

The problem is that I have to type the code exactly as the image, but I don't see how to get that big matrix with that respective spaces.

egreg · Accepted Answer

It's quite hard to understand what meaning the required alignment would carry.
A three column array with nested one column arrays should do.
documentclass{article}
usepackage{amsmath}

begin{document}

[
begin{array}{@{}l@{hspace{1cm}}ll@{}}
begin{array}[t]{@{}l@{}}
A= begin{pmatrix}
 -4  &  2  & 12 
 2  & -6 &  9  
 8  &  7 & -2
end{pmatrix}

A= begin{pmatrix}
 12 &  12  & -2 
 2  & 6 &  -9  
 end{pmatrix}
[6ex]
A= begin{pmatrix}
 11 &  9  & 13 
 12  & -2 &  21  
 end{pmatrix}
end{array}
&
begin{array}[t]{@{}l@{}}
A= begin{pmatrix}
 13  &  -21  & 9 & 12
 -9  & 2 &  -8 & -7 
 9  &  -2 & 1 & 7
 end{pmatrix}
[6ex]
A= begin{pmatrix}
 -3  &  2 & 8 & 7
 -4  & 2 &  8 & -7 
 2  & -12 &  11 & 32 
 1  & 5 &  -21 & -12 
 12  & -11 &  6 & 76 
 11  & 12 &  -11 & -29 
 end{pmatrix}
end{array}
&
begin{array}[t]{@{}l@{}}
[-2.5ex]
A= begin{pmatrix}
 12  &  11  
 11  & 22    
 8  &  12 
 end{pmatrix}
[6ex]
A= begin{pmatrix}
 12  &  7 & 2 & 12  
 7  & -4 & 2 & -6 
 7  &  -9 & 12 & -8
 end{pmatrix}
[4.5ex]
A= begin{pmatrix}
 -12  &  21 & -34 & -23  
 13  & -21 & 15 & 21 
 -43  &  16 & 32 & -19
 end{pmatrix}
end{array}
end{array}
]

end{document}

How can i do a matrix like this one?

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