\left|\begin{array}{rrr}
a_{11}&a_{12}&a_{13}\
a_{21}&a_{22}&a_{23}\
a_{31}&a_{32}&a_{33}
\end{array}\right|=
a_{11}(-1)^2\left|\begin{array}{rr}
a_{22}&a_{23}\a_{32}&a_{33}
\end{array}\right|+
a_{12}(-1)^3\left|\begin{array}{rr}
a_{21}&a_{23}\a_{31}&a_{33}
\end{array}\right|+
a_{13}(-1)^4\left|\begin{array}{rr}
a_{21}&a_{22}\a_{31}&a_{32}
\end{array}\right|=

=a_{11}\cdot(a_{22}a_{33}-a_{23}a_{32})-a_{12}\cdot(a_{21}a_{33}-a_{23}a_{31})+a_{13}\cdot(a_{21}a_{32}-a_{22}a_{31})

a_{11} = -2.1999999999999997 (slider from -5 to 5, step 0.1)
a_{12} = -1.4 (slider from -5 to 5, step 0.1)
a_{13} = -1.5 (slider from -5 to 5, step 0.1)
a_{21} = -1.0999999999999996 (slider from -5 to 5, step 0.1)
a_{22} = 2.6000000000000005 (slider from -5 to 5, step 0.1)
a_{23} = -1.4 (slider from -5 to 5, step 0.1)
a_{31} = -2.1999999999999997 (slider from -5 to 5, step 0.1)
a_{32} = -0.2999999999999998 (slider from -5 to 5, step 0.1)
a_{33} = 2.7 (slider from -5 to 5, step 0.1)
text1: "\left|\begin{array}{rrr}" + a_{11} + "&" + a_{12} + "&" + a_{13} + "\\" + a_{21} + "&" + a_{22} + "&" + a_{23} + "\\" + a_{31} + "&" + a_{32} + "&" + a_{33} + "
\end{array}\right|=(" + a_{11} + ")(-1)^2\left|\begin{array}{rr}" + a_{22} + "&" + a_{23} + "\\" + a_{32} + "&" + a_{33} + "
\end{array}\right|+(" + a_{12} + ")(-1)^3\left|\begin{array}{rr}" + a_{21} + "&" + a_{23} + "\\" + a_{31} + "&" + a_{33} + "
\end{array}\right|+(" + a_{13} + ")(-1)^4\left|\begin{array}{rr}" + a_{21} + "&" + a_{22} + "\\" + a_{31} + "&" + a_{32} + "
\end{array}\right|="
text2: "=(" + a_{11} + ")\cdot(" + (a_{22} a_{33} - a_{23} a_{32}) + ")-(" + a_{12} + ")\cdot(" + (a_{21} a_{33} - a_{23} a_{31}) + ")+(" + a_{13} + ")\cdot(" + (a_{21} a_{32} - a_{22} a_{31}) + ")=" + (a_{11} * (a_{22} a_{33} - a_{23} a_{32}) - a_{12} * (a_{21} a_{33} - a_{23} a_{31}) + a_{13} * (a_{21} a_{32} - a_{22} a_{31})) + "."