Ответ:

[tex]a)3 \frac{7}{12} - 1 \frac{11}{12 } \\ \frac{43}{12} - \frac{23}{12} \\ \frac{5}{3} = 1 \frac{2}{3} \\ \\ b)8 \frac{8}{31} - 5 \frac{9}{31} \\ \frac{256}{31} - \frac{164}{31} \\ \frac{92}{31} = 2 \frac{30}{31} \\ \\ v)15 \frac{5}{19} - 8 \frac{11}{19} \\ \frac{290}{19} - \frac{163}{19} \\ \frac{127}{19} = 6 \frac{13}{19} [/tex]