Question

Giúp em vs ạ , làm ơn 

Answer 1

a: Ta có: \(\left(\dfrac{3}{5}-\dfrac{7}{4}\right):\dfrac{23}{10}\)

\(=\dfrac{12-35}{20}\cdot\dfrac{10}{23}\)

\(=\dfrac{-23\cdot10}{23\cdot20}=-\dfrac{1}{2}\)

b: Ta có: \(\left(-\dfrac{2}{3}+\dfrac{3}{4}\right)^2\cdot\dfrac{12}{5}-\dfrac{11}{5}\)

\(=\dfrac{1}{144}\cdot\dfrac{12}{5}-\dfrac{11}{5}\)

\(=\dfrac{1}{60}-\dfrac{11}{5}=\dfrac{1}{60}-\dfrac{132}{60}=\dfrac{-131}{60}\)