Контрольные задания
Вопрос:Фото задания: Вычислите: 1) 2 1/3 + 1 1/6; 2) 1 2/5 + 1 4/15; 3) 1 2/7 + 2 3/14; 4) 4 8/9 + 3 11/18; 5) 3 5/7 + 1 2/21; 6) 2 3/5 + 2 11/25;…Фото задания

Ответ:

  1. Складываем целые части и дроби: \(2\frac{1}{3}+1\frac{1}{6}=3+\frac{2}{6}+\frac{1}{6}=3\frac{1}{2}\).
  2. \(1\frac{2}{5}+1\frac{4}{15}=2+\frac{6}{15}+\frac{4}{15}=2\frac{2}{3}\).
  3. \(1\frac{2}{7}+2\frac{3}{14}=3+\frac{4}{14}+\frac{3}{14}=3\frac{1}{2}\).
  4. \(4\frac{8}{9}+3\frac{11}{18}=7+\frac{16}{18}+\frac{11}{18}=8\frac{1}{2}\).
  5. \(3\frac{5}{7}+1\frac{2}{21}=4+\frac{15}{21}+\frac{2}{21}=4\frac{17}{21}\).
  6. \(2\frac{3}{5}+2\frac{11}{25}=4+\frac{15}{25}+\frac{11}{25}=5\frac{1}{25}\).
  7. \(5\frac{4}{9}+4\frac{2}{3}=9+\frac{4}{9}+\frac{6}{9}=10\frac{1}{9}\).
  8. \(3\frac{7}{8}+2\frac{3}{4}=5+\frac{7}{8}+\frac{6}{8}=6\frac{5}{8}\).
  9. \(6\frac{11}{12}+1\frac{5}{6}=7+\frac{11}{12}+\frac{10}{12}=8\frac{3}{4}\).
  10. \(9\frac{4}{5}+2\frac{9}{20}=11+\frac{16}{20}+\frac{9}{20}=12\frac{1}{4}\).