a) Ta có: \(\frac{1}{6}+\frac{-5}{8}+\frac{7}{12}\)
\(=\frac{4}{24}+\frac{-15}{24}+\frac{14}{24}\)
\(=\frac{4-15+14}{24}=\frac{3}{24}=\frac{1}{8}\)
b) Ta có: \(\frac{-13}{12}+\frac{3}{-8}+\frac{5}{16}\)
\(=\frac{-52}{48}+\frac{-18}{48}+\frac{15}{48}\)
\(=\frac{-52-18+15}{48}=\frac{-55}{48}\)
c) Ta có: \(\frac{11}{15}+\frac{-7}{20}+\frac{9}{10}\)
\(=\frac{44}{60}+\frac{-21}{60}+\frac{54}{60}\)
\(=\frac{44-21+54}{60}=\frac{77}{60}\)
d) Ta có: \(\frac{-11}{9}+\frac{5}{8}+\frac{7}{-12}\)
\(=\frac{-88}{72}+\frac{45}{72}+\frac{-42}{72}\)
\(=\frac{-85}{72}\)
