矩陣的乘法
Author: 李亭慧

a_{11} = 5 (slider from -5 to 10, step 1)
a_{12} = -5 (slider from -5 to 10, step 1)
a_{13} = -5 (slider from -5 to 10, step 1)
b_{11} = -3 (slider from -5 to 10, step 1)
b_{12} = -5 (slider from -5 to 10, step 1)
b_{13} = -2 (slider from -5 to 10, step 1)
c_{11} = 10 (slider from -5 to 10, step 1)
c_{12} = 0 (slider from -5 to 10, step 1)
c_{13} = 4 (slider from -5 to 10, step 1)
d_{11} = -5 (slider from -5 to 10, step 1)
d_{12} = -3 (slider from -5 to 10, step 1)
d_{13} = 1 (slider from -5 to 10, step 1)
text1: "$ \left [  \begin{array}{} " + (LaTeX[a_{11}]) + " & " + (LaTeX[a_{12}]) + " & " + (LaTeX[a_{13}]) + " \\ " + (LaTeX[b_{11}]) + " & " + (LaTeX[b_{12}]) + " & " + (LaTeX[b_{13}]) + " \\  " + (LaTeX[c_{11}]) + "& " + (LaTeX[c_{12}]) + " & " + (LaTeX[c_{13}]) + " \\ \end{array}\right ] \left [ \begin{array}{} " + (LaTeX[d_{11}]) + " \\ " + (LaTeX[d_{12}]) + " \\ " + (LaTeX[d_{13}]) + " \end{array}  \right ] =\left [ \begin{array}{} " + (LaTeX[a_{11} * d_{11} + a_{12} * d_{12} + a_{13} * d_{13}]) + " \\" + (LaTeX[b_{11} * d_{11} + b_{12} * d_{12} + b_{13} * d_{13}]) + "  \\ " + (LaTeX[c_{11} * d_{11} + c_{12} * d_{12} + c_{13} * d_{13}]) + " \end{array}  \right ] "