Tính

a) $\frac{7}{3}+\frac{9}{5}$ = ................................................... = ................................................... c) $\frac{19}{8}-\frac{2}{7}$ = ................................................... = ...................................................

b) $\frac{9}{4}+\frac{5}{13}$ = ................................................... = ................................................... d) $\frac{31}{11}-\frac{4}{5}$ = ................................................... = ...................................................

a) $\frac{1}{8}+\frac{1}{3}$

= ................................

= ................................

$\frac{32}{5}+\frac{3}{11}$

= ................................

= ................................

$\frac{6}{7}+\frac{11}{9}$

= ................................

= ................................

b) $\frac{1}{2}-\frac{1}{7}$

= ................................

= ................................

$\frac{7}{9}-\frac{2}{5}$

= ................................

= ................................

$\frac{14}{9}-\frac{3}{11}$

= ................................

= ................................

a) $\frac{3}{2}-\frac{1}{5}=\frac{13}{10}$           

b)$\frac{4}{9}+\frac{1}{4}=\frac{7}{36}$              

c) $\frac{1}{7}+\frac{1}{4}=\frac{2}{11}$               

d) $\frac{13}{5}-\frac{2}{7}=\frac{81}{35}$

a) $3+\frac{3}{10}$

= ...................................................

= ...................................................

c) $\frac{19}{6}-2$

= ...................................................

= ...................................................

b) $5-\frac{9}{7}$

= ...................................................

= ...................................................

d) $\frac{64}{7}-5$

= ...................................................

= ...................................................