Matrix

A=[2315]A=\begin{bmatrix} 2 & 3 \\ 1 & 5 \end{bmatrix}

B=[436123]B=\begin{bmatrix} 4 & 3 & 6 \\ 1 & -2 & 3 \end{bmatrix}

Equaltion

{2×(4t1+3t2+6t3)+3(ti2t2+3t3)=a14t1+3t2+6t3+5×(t12t2+3t3)=a2\begin{cases}2\times\left( 4t_{1}+3t_{2}+6t_{3}\right) +3\left( t_{i}-2t_{2}+3t_{3}\right) =a_{1}\\4t_{1}+3t_{2}+6t_{3}+5\times\left( t_{1}-2t_{2}+3t_{3}\right) =a_{2}\end{cases}

Text

RD\overline{R_D}

RD\underline{R_D}