Помогите пож номер16

Решите задачу:

$1- \frac{23}{30} = \frac{30}{30}- \frac{23}{30}= \frac{7}{30} \\ \\ 1 \frac{5}{9}-1= \frac{5}{9} \\ \\ 2 \frac{5}{9}-1 \frac{4}{9}=1 \frac{1}{9}$

$1- \frac{7}{10}= \frac{3}{10} \\ \\ 12 \frac{5}{7}-2=10 \frac{5}{7} \\ \\ 4\frac{3}{5}-3 \frac{2}{5}=1 \frac{1}{5}$

$1- \frac{2}{21} = \frac{19}{21} \\ \\ 14 \frac{2}{3} -10=4 \frac{2}{3} \\ \\ 10 \frac{2}{3} -8 \frac{1}{3}=2 \frac{1}{3}$