Điền số thích hợp vào chỗ chấm.

a) \(\frac{3}{4} + \frac{8}{5} = \frac{{......}}{{......}}\)                                

b) \(\frac{2}{9} + \frac{5}{2} = \frac{{......}}{{......}}\)         

c) \(\frac{5}{8} + \frac{2}{7} = \frac{{......}}{{......}}\)         

d) \(\frac{2}{3} + \frac{1}{8} = \frac{{......}}{{......}}\)

e) \(\frac{3}{2} - \frac{6}{7} = \frac{{......}}{{......}}\)                                

f) \(\frac{7}{5} - \frac{1}{6} = \frac{{......}}{{......}}\)         

g) \(\frac{8}{9} - \frac{2}{7} = \frac{{......}}{{......}}\)         

h) \(\frac{9}{4} - \frac{5}{9} = \frac{{......}}{{......}}\)