ПОМОГИТЕ Выполни вычитание: г) 8-7/9 д) 6целых 7/8 - 9/10 е) 31целая 5/16 - 21целая 9/16...

Решите задачу:

$8- \frac{7}{9}=7 \frac{9}{9}- \frac{7}{9}=7 \frac{2}{9} ; \\ 6 \frac{7}{8}- \frac{9}{10}=6 \frac{35}{40} - \frac{36}{40} =5 \frac{75}{40}- \frac{36}{40} =5 \frac{39}{40} ; \\ 31 \frac{5}{16} -21 \frac{9}{16}=30 \frac{21}{16}-21 \frac{9}{16}=9 \frac{12}{16} =9 \frac{3}{4} ; \\ 10- \frac{11}{17} =9 \frac{17}{17}- \frac{11}{17} =9 \frac{6}{17} ; \\ 7 \frac{5}{12} -5 \frac{4}{9} =7 \frac{15}{36} -5 \frac{16}{36}=6\frac{51}{36}-5 \frac{16}{36}=15 \frac{35}{36}; \\$

$70 \frac{5}{72} -67 \frac{23}{72}=69 \frac{77}{72} -67 \frac{23}{72}=2 \frac{54}{72}= 2 \frac{3}{4} .$