Question

  Giải nhanh giúp mik vs

Answer 1

a) \(x-\dfrac{1}{5}=\dfrac{-2}{15}\)

\(\Rightarrow x=\dfrac{-2}{15}+\dfrac{1}{5}\)

\(\Rightarrow x=\dfrac{-2}{15}+\dfrac{3}{15}\)

\(\Rightarrow x=\dfrac{1}{15}\)

b) \(8\cdot\left(3^2+1\right)-\dfrac{2}{7}\cdot7\)

\(=8\cdot\left(9+1\right)-\dfrac{2\cdot7}{7}\)

\(=8\cdot10-2\)

\(=80-2\)

\(=78\)