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यदि $\left[\begin{array}{cc}a+b & 4 \\ -3 & a b\end{array}\right]=\left[\begin{array}{cc}6 & 4 \\ -3 & 8\end{array}\right]$ हो तो a व b के मान ज्ञात कीजिए।
यदि $x+y=\left[\begin{array}{ll}2 & 1 \\ 1 & 2\end{array}\right]$ तथा $2 x-y=\left[\begin{array}{ll}1 & 2 \\ 2 & 1\end{array}\right]$ हो, तो x का मान ज्ञात कीजिए।