Помогите СРОЧНО 543 *1,2,3,4*541,545

541.
1) $3 = 1 \frac{5}{7} + 1 \frac{2}{7} .$
2) $5 = 2 \frac{1}{7} + 2 \frac{6}{7} .$
3) $8=3 \frac{4}{7} + 4 \frac{3}{7} .$
4) $9 = 5 \frac{3}{7} + 3 \frac{4}{7}.$

543.
1) $12 \frac{5}{9} - 7 \frac{1}{6} = 12 \frac{10}{18} - 7 \frac{3}{18} =5 \frac{7}{18} .$
2) $7 \frac{1}{4} - 3 \frac{7}{15} = \frac{435}{60} - \frac{208}{60} = \frac{227}{60}=3 \frac{47}{60} .$
3) $9 \frac{5}{12} - 6 \frac{2}{7} =9 \frac{35}{84}- 6 \frac{24}{84} = 3 \frac{11}{84} .$
4) $4 \frac{1}{6} -2 \frac{4}{21} = 3 \frac{49}{42}- 2 \frac{8}{42} =1 \frac{41}{42} .$