Question

thực hiện phép tính

a, \(\frac{-5}{21}+\frac{2}{9}\)

b, \(\frac{-4}{21}-\frac{5}{12}\)

c,\(\frac{6}{-4}+\frac{1}{8}\)

d, \(\frac{-56}{77}-\frac{30}{66}\)

e,\(\frac{-3}{9}+\frac{5}{-3}\)

Answer 1

a, \(\frac{-5}{21}+\frac{2}{9}=\frac{-15}{63}+\frac{14}{63}=\frac{-1}{63}\)

b, \(\frac{-4}{21}-\frac{5}{12}=\frac{-16}{84}-\frac{35}{84}=\frac{-51}{84}=\frac{-17}{28}\)

c, \(\frac{6}{-4}+\frac{1}{8}=\frac{-3}{2}+\frac{1}{8}=\frac{-12}{8}+\frac{1}{8}=\frac{-11}{8}\)

d, \(\frac{-56}{77}-\frac{30}{66}=\frac{-8}{11}-\frac{5}{11}=\frac{-13}{11}\)

e, \(\frac{-3}{9}+\frac{5}{-3}=\frac{-1}{3}+\frac{-5}{3}=\frac{-6}{3}=-2\)