b: Ta có: \(\left(47+\dfrac{1}{9}\right):\dfrac{-5}{2}-\left(27+\dfrac{1}{9}\right):\dfrac{-5}{2}\)
\(=\left(47+\dfrac{1}{9}-27-\dfrac{1}{9}\right)\cdot\dfrac{-2}{5}\)
\(=-20\cdot\dfrac{2}{5}=-8\)
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