TeX джерело:

{\;\left|\begin{array}{cccc}a_{11}&a_{12}&\dots&a_{1n}\\a_{21}&a_{22}&\dots&a_{2n}\\ \dots& \dots&\dots&\dots\\ a_{n1}&a_{n2}&\dots&a_{nn} \end{array}\right| +\left|\begin{array}{cccc}a_{11}&a_{12}&\dots&b_{1n}\\a_{21}&a_{22}&\dots&b_{2n}\\ \dots& \dots&\dots&\dots\\ a_{n1}&a_{n2}&\dots&b_{nn} \end{array}\right| \;=\;\left|\begin{array}{cccc}a_{11}&a_{12}&\dots&a_{1n}+b_{1n}\\a_{21}&a_{22}&\dots&a_{2n}+b_{2n}\\ \dots& \dots&\dots&\dots\\ a_{n1}&a_{n2}&\dots&a_{nn}+b_{nn} \end{array}\right|}