14/21+3/2 с решением,

[tex] \frac{14}{21} = \frac{14:7}{21:7} = \frac{2}{3} \\ \\ \frac{2}{3} + \frac{3}{2} =\frac{2*2}{3*2} + \frac{3*3}{2*3} =\frac{4}{6} + \frac{9}{6} = \frac{13}{6} =\frac{2*6+1}{6} =2 \frac{1}{6} [/tex]