Question

Giúp tớ với 

Answer 1

Bài 1: 

a: \(=\dfrac{-1}{12}-\dfrac{21}{8}+\dfrac{1}{3}\)

\(=\dfrac{-2}{24}-\dfrac{63}{24}+\dfrac{8}{24}=\dfrac{-57}{24}=\dfrac{-19}{8}\)

b: \(=-\dfrac{7}{4}+\dfrac{1}{9}+2+\dfrac{1}{18}\)

\(=-\dfrac{63}{36}+\dfrac{4}{36}+\dfrac{72}{36}+\dfrac{2}{36}=\dfrac{15}{36}=\dfrac{5}{12}\)

c: \(=\dfrac{2}{5}-\dfrac{4}{3}-\dfrac{1}{2}\)

\(=\dfrac{12}{30}-\dfrac{40}{30}-\dfrac{15}{30}=\dfrac{-43}{30}\)

d: \(=\dfrac{1}{4}-\dfrac{2}{5}+\dfrac{3}{10}=\dfrac{5}{20}-\dfrac{8}{20}+\dfrac{6}{20}=\dfrac{3}{20}\)