Toán học

\(\left[\begin{array}{ccc}1&2&3\\4&5&6\\7&8&9\end{array}\right]\) = \(\left[\begin{array}{ccc}2&4&2\\1&1&1\\3&5&7\end{array}\right]\)

\(\int_0^\infty \mathrm{x}\,\mathrm{d}x\)

Giúp mình với:

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)