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\begin{tikzpicture}[ampersand replacement=\&]
\matrix (A)[matrix of math nodes, label skeleton, left delimiter=[,right delimiter={]}] at (0,0)
{
A_{1,1} \& \cdots \& A_{1,k} \& \cdots \& A_{1,n} \\
\vdots \& \& \vdots \& \& \vdots \\
A_{i,1} \& \cdots \& A_{i,k} \& \cdots \& A_{i,n} \\
\vdots \& \& \vdots \& \& \vdots \\
A_{m,1} \& \cdots \& A_{m,k} \& \cdots \& A_{m,n} \\
};
\node [right=0.1 of A] (mul) {$\cdot$};
\matrix (B)[right=0.1 of mul, matrix of math nodes, label skeleton, left delimiter=[,right delimiter={]}]
{
B_{1,1} \& \cdots \& B_{1,j} \& \cdots \& B_{1,p} \\
\vdots \& \& \vdots \& \& \vdots \\
B_{k,1} \& \cdots \& B_{k,j} \& \cdots \& B_{k,p} \\
\vdots \& \& \vdots \& \& \vdots \\
B_{n,1} \& \cdots \& B_{n,j} \& \cdots \& B_{n,p} \\
};
\node [right=0.1 of B] (eq) {$=$};
\matrix (C)[right=0.1 of eq, matrix of math nodes, label skeleton, left delimiter=[,right delimiter={]}]
{
C_{1,1} \& \cdots \& C_{1,j} \& \cdots \& C_{1,p} \\
\vdots \& \& \vdots \& \& \vdots \\
C_{i,1} \& \cdots \& C_{i,j} \& \cdots \& C_{i,p} \\
\vdots \& \& \vdots \& \& \vdots \\
C_{m,1} \& \cdots \& C_{m,j} \& \cdots \& C_{m,p} \\
};
\node[opacity=0.5, rounded corners=2pt, inner sep=-1pt, fill=green, fit=(A-3-1)(A-3-5)] {};
\node[opacity=0.5, rounded corners=2pt, inner sep=-1pt, fill=blue, fit=(B-1-3)(B-5-3)] {};
\node[opacity=0.5, rounded corners=2pt, inner sep=-1pt, fill=red, fit=(C-3-3)] {};
\end{tikzpicture}
\end{document}
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