$$\left. \begin{array} { l } { A = \{ \frac { - 5 } { 2 } + 1.5 } \\ { B = [ \frac { 1 } { 2 } , 2 ] } \\ { + 4 k } \\ { + m e } \\ { A B = 0 , 0 } \end{array} \right.$$
$$A=[[-5,1,3,0],[7,6,0,0],[1,1,1,1]]2*dFi*ePr*tABDA*a*n^2*d^2*t*h*o*u*c$$