Question

Giúp tớ ngay bây giờ với

Answer 1

a: \(=\dfrac{-5}{17}+\dfrac{-30}{170}=\dfrac{-5}{17}-\dfrac{3}{17}=\dfrac{-8}{17}\)

b: \(=\dfrac{5}{12}+\dfrac{6}{12}=\dfrac{11}{12}\)

c: \(=\dfrac{-2\cdot3+5}{15}\cdot\dfrac{3\cdot7-3\cdot2}{14}\)

\(=\dfrac{-1}{15}\cdot\dfrac{15}{14}=\dfrac{-1}{14}\)

d: \(=\dfrac{3}{2}\cdot\dfrac{4}{3}\cdot\dfrac{5}{4}=\dfrac{5}{2}\)

e: \(=\dfrac{1}{5}\cdot10-\dfrac{1}{3}\cdot\dfrac{24-45}{20}\)

\(=2-\dfrac{1}{3}\cdot\dfrac{-21}{20}=2+\dfrac{7}{20}=\dfrac{47}{20}\)