Bài 1:
a: \(A=\dfrac{1}{9}\cdot9-9-14\cdot\dfrac{1}{7}+\dfrac{5}{2}\)
\(=1-9-2+\dfrac{5}{2}=-10+\dfrac{5}{2}=\dfrac{-20+5}{2}=-\dfrac{15}{2}\)
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