7. Решите примеры. 11\frac{3}{8}-4\frac{7}{8} 15\frac{1}{5}-6\frac{4}{5} 9\frac{7}{10}+3\frac{9}{10}-4 13\frac{4}{9}-2\frac{5}{9} 8\frac{5}{6}+3\frac{5}{6}-7 8-3\frac{4}{15}+6\frac{7}{15}

Решим примеры:

1. $$11\frac{3}{8}-4\frac{7}{8}=10\frac{11}{8}-4\frac{7}{8}=(10-4)+\frac{11-7}{8}=6+\frac{4}{8}=6\frac{1}{2}$$
2. $$15\frac{1}{5}-6\frac{4}{5}=14\frac{6}{5}-6\frac{4}{5}=(14-6)+\frac{6-4}{5}=8+\frac{2}{5}=8\frac{2}{5}$$
3. $$9\frac{7}{10}+3\frac{9}{10}-4=(9+3-4)+\frac{7+9}{10}=8+\frac{16}{10}=8+1\frac{6}{10}=9\frac{3}{5}$$
4. $$13\frac{4}{9}-2\frac{5}{9}=12\frac{13}{9}-2\frac{5}{9}=(12-2)+\frac{13-5}{9}=10+\frac{8}{9}=10\frac{8}{9}$$
5. $$8\frac{5}{6}+3\frac{5}{6}-7=(8+3-7)+\frac{5+5}{6}=4+\frac{10}{6}=4+1\frac{4}{6}=5\frac{2}{3}$$
6. $$8-3\frac{4}{15}+6\frac{7}{15}=(8-3+6)+\frac{-4+7}{15}=11+\frac{3}{15}=11\frac{1}{5}$$

Ответ: 1) $$6\frac{1}{2}$$, 2) $$8\frac{2}{5}$$, 3) $$9\frac{3}{5}$$, 4) $$10\frac{8}{9}$$, 5) $$5\frac{2}{3}$$, 6) $$11\frac{1}{5}$$