Контрольные задания
Вопрос:

Вариант 2: выполните сложение: 1) 1/4 + 1/12; 2) 1/6 + 2/3; 3) 7/8 + 3/4; 4) 4/7 + 2/21; 5) 9/12 + 3/4; 6) 8/9 + 1/3; 7) 4/5 + 7/15; 8) 2/21 + 5/14; 9) 3/18 + 5/27; 10) 3/15 + 7/20.

Фото задания: Вариант 2: выполните сложение: 1) 1/4 + 1/12; 2) 1/6 + 2/3; 3) 7/8 + 3/4; 4) 4/7 + 2/21; 5) 9/12 + 3/4; 6) 8/9 + 1/3; 7)…Фото задания

Ответ:

  1. \(\frac{1}{4}+\frac{1}{12}=\frac{3}{12}+\frac{1}{12}=\frac{1}{3}\).
  2. \(\frac{1}{6}+\frac{2}{3}=\frac{1}{6}+\frac{4}{6}=\frac{5}{6}\).
  3. \(\frac{7}{8}+\frac{3}{4}=\frac{7}{8}+\frac{6}{8}=\frac{13}{8}=1\frac{5}{8}\).
  4. \(\frac{4}{7}+\frac{2}{21}=\frac{12}{21}+\frac{2}{21}=\frac{14}{21}=\frac{2}{3}\).
  5. \(\frac{9}{12}+\frac{3}{4}=\frac{9}{12}+\frac{9}{12}=\frac{18}{12}=1\frac{1}{2}\).
  6. \(\frac{8}{9}+\frac{1}{3}=\frac{8}{9}+\frac{3}{9}=\frac{11}{9}=1\frac{2}{9}\).
  7. \(\frac{4}{5}+\frac{7}{15}=\frac{12}{15}+\frac{7}{15}=\frac{19}{15}=1\frac{4}{15}\).
  8. \(\frac{2}{21}+\frac{5}{14}=\frac{4}{42}+\frac{15}{42}=\frac{19}{42}\).
  9. \(\frac{3}{18}+\frac{5}{27}=\frac{1}{6}+\frac{5}{27}=\frac{9}{54}+\frac{10}{54}=\frac{19}{54}\).
  10. \(\frac{3}{15}+\frac{7}{20}=\frac{1}{5}+\frac{7}{20}=\frac{4}{20}+\frac{7}{20}=\frac{11}{20}\).