# Matrix inside a matrix with aligning rows

How is it possible to make such a construction in LaTeX?

It's simple with blkarray:
\documentclass[12pt]{report}
$\begin{blockarray}{rrccc} & von: & N & K & E \\ \begin{block}{rr(ccc)} N & & 0 & 0 & 0,4 \\ nach: K & A= & 0,75 & 0 & 0 \\ E & & 0 & 0,8 & 0,8 \\ \end{block} \end{blockarray}$