Решить уравнение: 1) x - 7 1/3 = 12 5/12; 2) 11 7/9 - x = 8 5/7; 3) (5 7/9 - x) + 2 3/4 = 3 5/12. Выполнить действия: 1) 9 5/9 + 5 1/4 - 8 3/8; 2) 6 10/21 - 3 5/14 + 4 5/6; 3) 7 11/12 + 6 1/15 - 8,3.

Решим задания из номера 9 (уравнения) и 10 (вычисления). **Номер 9** 1) $x - 7 \frac{1}{3} = 12 \frac{5}{12}$ $x = 12 \frac{5}{12} + 7 \frac{1}{3} = 12 \frac{5}{12} + 7 \frac{4}{12} = 19 \frac{9}{12} = 19 \frac{3}{4}$ 2) $11 \frac{7}{9} - x = 8 \frac{5}{7}$ $x = 11 \frac{7}{9} - 8 \frac{5}{7} = 11 \frac{49}{63} - 8 \frac{45}{63} = 3 \frac{4}{63}$ 3) $(5 \frac{7}{9} - x) + 2 \frac{3}{4} = 3 \frac{5}{12}$ $5 \frac{7}{9} - x = 3 \frac{5}{12} - 2 \frac{3}{4} = 3 \frac{5}{12} - 2 \frac{9}{12} = 2 \frac{17}{12} - 2 \frac{9}{12} = \frac{8}{12} = \frac{2}{3}$ $x = 5 \frac{7}{9} - \frac{2}{3} = 5 \frac{7}{9} - \frac{6}{9} = 5 \frac{1}{9}$ **Номер 10** 1) $9 \frac{5}{9} + 5 \frac{1}{4} - 8 \frac{3}{8} = 9 \frac{40}{72} + 5 \frac{18}{72} - 8 \frac{27}{72} = 14 \frac{58}{72} - 8 \frac{27}{72} = 6 \frac{31}{72}$ 2) $6 \frac{10}{21} - 3 \frac{5}{14} + 4 \frac{5}{6} = 6 \frac{20}{42} - 3 \frac{15}{42} + 4 \frac{35}{42} = 3 \frac{5}{42} + 4 \frac{35}{42} = 7 \frac{40}{42} = 7 \frac{20}{21}$ 3) $7 \frac{11}{12} + 6 \frac{1}{15} - 8,3 = 7 \frac{55}{60} + 6 \frac{4}{60} - 8 \frac{3}{10} = 13 \frac{59}{60} - 8 \frac{18}{60} = 5 \frac{41}{60}$