Выполните вычитание (вариант 1, задания 7-10): 7 a) $$15\frac{7}{15} - 15\frac{4}{15}$$; 8 a) $$9\frac{4}{9} - 2\frac{5}{9}$$; 9 a) $$14\frac{3}{7} - 7\frac{2}{7}$$; 10 a) $$12\frac{10}{12} - 9\frac{2}{9}$$

7 a) $$15\frac{7}{15} - 15\frac{4}{15} = (15-15) + (\frac{7}{15}-\frac{4}{15})= \frac{3}{15}=\frac{1}{5}$$ 8 a) $$9\frac{4}{9} - 2\frac{5}{9}= 9\frac{4}{9} - 2\frac{5}{9}= 8\frac{13}{9}-2\frac{5}{9} =6 \frac{8}{9}$$ 9 a) $$14\frac{3}{7} - 7\frac{2}{7} = (14-7) + (\frac{3}{7}-\frac{2}{7})= 7+\frac{1}{7}=7 \frac{1}{7}$$ 10 a) $$12\frac{10}{12} - 9\frac{2}{9}=12\frac{10}{12} - 9\frac{2}{9}= 12 \frac{5}{6} - 9 \frac{2}{9}= 12 \frac{15}{18}-9\frac{4}{18}= 3 \frac{11}{18}$$