\(B=\sqrt{\dfrac{25}{\left(3+\sqrt{11}\right)^2}}-\sqrt{\dfrac{16}{\left(2-\sqrt{11}\right)^2}}\)
\(=\sqrt{\left(\dfrac{5}{\sqrt{11}+3}\right)^2}-\sqrt{\left(\dfrac{4}{\sqrt{11}-2}\right)^2}\)
\(=\dfrac{5}{\sqrt{11}+3}-\dfrac{4}{\sqrt{11}-2}\)
\(=\dfrac{5\sqrt{11}-10-4\sqrt{11}-12}{\left(\sqrt{11}+3\right)\left(\sqrt{11}-2\right)}\)
\(=\dfrac{\sqrt{11}-22}{11-2\sqrt{11}+3\sqrt{11}-6}\)
\(=\dfrac{\sqrt{11}-22}{\sqrt{11}+5}\)
=>m=-22 và n=5
=>m-n=-27
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