Bài 8: Thực hiện phép tính 1) ((3)/(5)+(-2)/(7))+(-1)/(5) 2) (5)/(9)+((-4)/(9)+2) 4) (14)/(13)+((-1)/(13)-(19)/(20)) 5) (-2)/(49)-((47)/(49)+(5)/(-3)) 7) (7)/(-18)+((-5)/(12)-(13)/(-18)) S) (-13)/(17)+((13)/(-21)+(-4)/(17)) 10) (1)/(10)-((5)/(12)-(1)/(15)) 11) (-5)/(11)+((-6)/(11)+1) 3) ((-2)/(-5)+(-5)/(-6))+(4)/(5) (1) (-24)/(17)-((-7)/(17)-(1)/(16)) 9) ((13)/(-10)-(-4)/(13))+(11)/(-10) 12 (-6)/(13)+(1+(-7)/(13))

1) $\frac{3}{5} + \frac{-2}{7} + \frac{-1}{5} = \frac{4}{35}$<br />2) $\frac{5}{9} + \frac{-4}{9} + 2 = \frac{19}{9}$<br />3) $\frac{-2}{-5} + \frac{-5}{-6} + \frac{4}{5} = \frac{1}{20}$<br />4) $\frac{14}{13} + \frac{-1}{13} - \frac{19}{20} = \frac{2}{3}$<br />5) $\frac{-2}{49} - \frac{47}{49} - \frac{5}{-3} = -\frac{1}{12}$<br />6) $\frac{7}{-18} + \frac{-5}{12} - \frac{13}{-18} = -\frac{1}{4}$<br />7) $\frac{-13}{17} + \frac{13}{-21} + \frac{-4}{17} = -\frac{34}{21}$<br />8) $\frac{1}{10} - \frac{5}{12} + \frac{1}{15} = -\frac{15}{16}$<br />9) $\frac{-5}{11} + \frac{-6}{11} + 1 = -\frac{136}{65}$<br />10) $\frac{-2}{-5} + \frac{-5}{-6} + \frac{4}{5} = \frac{1}{20}$<br />11) $\frac{-24}{17} - \frac{-7}{17} - \frac{1}{16} = \frac{61}{30}$<br />12) $\frac{-6}{13} + 1 + \frac{-7}{13} = 0$