Bài 4: Thực hiện phép tính 2) (-2)/(5)+(1)/(3) 3) (3)/(-5)-(-1)/(2) 4) (3)/(5)-(-5)/(6) 1) (1)/(4)-(2)/(3) 5) (-3)/(8)+(2)/(5) 6) (3)/(5)-(-1)/(3) 7) (1)/(-4)-(2)/(5) 8) -(2)/(3)-(5)/(4) 9) (-4)/(5)+(-3)/(4) 10) (-5)/(7)-(1)/(3) 11) (-5)/(2)-(4)/(3) 12 (3)/(2)+(-6)/(5) 13) (-1)/(6)-(3)/(5) 14) (-2)/(3)+(1)/(-7) 15) (1)/(7)-(-2)/(8) 16 (2)/(5)+(-6)/(7) 17) (-7)/(5)-(1)/(8) 18) -(4)/(7)-(5)/(-3) 19) -(2)/(7)+(4)/(-5) 20) (1)/(-2)-(4)/(13) 21) (2)/(5)-(-1)/(7) 22) (-3)/(8)+(2)/(-7) 23) (5)/(8)-(-8)/(5) 24) (-4)/(3)-(6)/(7)

2) \(-\frac{2}{5}+\frac{1}{3} = -\frac{6}{15}+\frac{5}{15} = -\frac{1}{15}\) 3) \(\frac{3}{-5}-\frac{-1}{2} = -\frac{3}{5}+\frac{1}{2} = -\frac{6}{10}+\frac{5}{10} = -\frac{1}{10}\) 4) \(\frac{3}{5}-\frac{-5}{6} = \frac{3}{5}+\frac{5}{6} = \18}{30}+\frac{25}{30} = \frac{43}{30}\) 1) \(\frac{1}{4}-\frac{2}{3} = \frac{3}{12}-\frac{8}{12} = -\frac{5}{12}\) 5) \(\frac{-3}{8}+\frac{2}{5} = -\frac{15}{40}+\frac{16}{40} = \frac{1}{40}\) 6) \(\frac{3}{5}-\frac{-1}{3} = \frac{3}{5}+\frac{1}{3} = \frac{9}{15}+\frac{5}{15} = \frac{14}{15}\) 7) \(\frac{1}{-4}-\frac{2}{5} = -\frac{1}{4}-\frac{2}{5} = -\frac{5}{20}-\frac{8}{20} = -\frac{13}{20}\) 8) \(-\frac{2}{3}-\frac{5}{4} = -\frac{8}{12}-\frac{15}{12} = -\frac{23}{12}\) 9) \(\5}+\frac{-3}{4} = -\frac{16}{20}-\frac{15}{20} = -\frac{31}{20}\) 10) \(\frac{-5}{7}-\frac{1}{3} = -\frac{15}{21}-\frac{7}{21} = -\frac{22}{21}\) 11) \(\frac{-5}{2}-\frac{4}{3} = -\frac{15}{6}-\frac{8}{6} = -\frac{23}{6}\) 12) \(\frac{3}{2}+\frac{-6}{5} = \frac{15}{frac{12}{10} = \frac{3}{10}\) 13) \(\frac{-1}{6}-\frac{3}{5} = -\frac{5}{30}-\frac{18}{30} = -\frac{23}{30}\) 14) \(\frac{-2}{3}+\frac{1}{-7} = -\frac{14}{21}+\frac{3}{21} = -\frac{11}{21}\) 15) \(\frac{1}{7}-\frac{-2}{8} = \frac{8}{56}+\frac{14}{