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$5 \frac{1}{17} :2 \frac{9}{17} = \frac{86}{17} : \frac{43}{17} = \frac{86}{17} * \frac{17}{43} = \frac{2}{1} =2 \\ \\ 1 \frac{7}{8} *1 \frac{3}{7} = \frac{15}{8} * \frac{10}{7} = \frac{75}{28} =2 \frac{19}{28} \\ \\ 1 \frac{1}{2} *2= \frac{3}{2} * \frac{2}{1} = \frac{3}{1} =3 \\ \\ \frac{11}{16} +4 \frac{7}{8} = \frac{11}{16} +4 \frac{14}{16} =4 \frac{25}{16} =5 \frac{9}{16} \\ \\ 2 \frac{13}{20} -1 \frac{5}{12} =2 \frac{39}{60} -1 \frac{25}{60} =1 \frac{14}{60} =1 \frac{7}{30} \\ \\ \frac{7}{15} :1 \frac{1}{2}= \frac{7}{15} : \frac{3}{2} = \frac{7}{15}* \frac{2}{3}= \frac{14}{45} \\ \\ 6-1 \frac{8}{17} =5 \frac{17}{17} -1 \frac{8}{17} =4 \frac{9}{17} \\ \\ \frac{1}{14} +4 \frac{1}{4} = \frac{2}{28} +4 \frac{7}{28} =4 \frac{9}{28}$