Matrix multiplication/Complex matrices/Exercise

Compute the product of matrices

$\left(\begin{array}{ccc}2+\mathrm{i}& 1-\frac{1}{2}\mathrm{i}& 4\mathrm{i}\\ -5+7\mathrm{i}& \sqrt{2}+\mathrm{i}& 0\end{array}\right)\left(\begin{array}{cc}-5+4\mathrm{i}& 3-2\mathrm{i}\\ \sqrt{2}-\mathrm{i}& e+\pi \mathrm{i}\\ 1& -\mathrm{i}\end{array}\right)\left(\begin{array}{c}1+\mathrm{i}\\ 2-3\mathrm{i}\end{array}\right),$

according to the two possible parentheses.

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