a: Khi x=4 thì \(A=\dfrac{2-5}{4-2+1}=\dfrac{-3}{3}=-1\)
b: \(B=\dfrac{x-5\sqrt{x}+2x+10\sqrt{x}-3x-3\sqrt{x}+10}{x-25}\)
\(=\dfrac{2\sqrt{x}+10}{x-25}=\dfrac{2}{\sqrt{x}-5}\)
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