B3. Rút gọn a) A = \(\begin{pmatrix} \sqrt{x + 3} & x - 2 \\ \sqrt{x - 3} & x - g \end{pmatrix}\) \(= x + 6\sqrt{x} + 9\) \(= 6x + 11\) b) B = \(\begin{pmatrix} \sqrt{x + 1} & x - 3\sqrt{x} \\ \sqrt{x - 4} & x - 3\sqrt{x} - 4 \end{pmatrix}\), \(5\sqrt{c} + 1\) \( = 3x + 3\sqrt{c}\) c) C = \(\sqrt{x + 5} - \sqrt{5} - 4\sqrt{x}\) \(x - 5\sqrt{c}\) \(c + 5\sqrt{c}\) d) D = \(-\sqrt{x - 1} - \sqrt{x - 1} - 2x\) \(\frac{\sqrt{x} - 2}{\sqrt{x} - 2}\) \( = 1 - x\)

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B3. Rút gọn
a) A =
\(\begin{pmatrix}
\sqrt{x + 3} & x - 2 \\
\sqrt{x - 3} & x - g
\end{pmatrix}\)
\(= x + 6\sqrt{x} + 9\)
\(= 6x + 11\)

b) B =
\(\begin{pmatrix}
\sqrt{x + 1} & x - 3\sqrt{x} \\
\sqrt{x - 4} & x - 3\sqrt{x} - 4
\end{pmatrix}\), \(5\sqrt{c} + 1\)
\( = 3x + 3\sqrt{c}\)

c) C = \(\sqrt{x + 5} - \sqrt{5} - 4\sqrt{x}\)
\(x - 5\sqrt{c}\)
\(c + 5\sqrt{c}\)

d) D = \(-\sqrt{x - 1} - \sqrt{x - 1} - 2x\)
\(\frac{\sqrt{x} - 2}{\sqrt{x} - 2}\)
\( = 1 - x\)