a: \(A=\dfrac{\left(x-6\right)^2}{\left|x-5\right|}+\dfrac{x^2-36}{x-5}\)
\(=\dfrac{-\left(x-6\right)^2}{x-5}+\dfrac{x^2-36}{x-5}\)
\(=\dfrac{-x^2+12x-36+x^2-36}{x-5}=\dfrac{12x-72}{x-5}\)
Khi x=4 thì \(A=\dfrac{12\cdot\left(4-6\right)}{4-5}=24\)
b: \(B=5x-5\sqrt{5}+\dfrac{x\sqrt{x+5}}{\sqrt{x+5}}=6x-5\sqrt{5}=6\sqrt{5}-5\sqrt{5}=\sqrt{5}\)
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