Ответ:

1. Сложение:

a)

  • \( 4705 + 44573 = 49278 \)
  • \( 3485 + 27341 = 30826 \)
  • \( 23904 + 7066 = 30970 \)
  • \( 1945 + 226 = 2171 \)
  • \( 1022 + 999 = 2021 \)

б)

  • \( 2,8 + 1,9 = 4,7 \)
  • \( 4,6 + 0,5 = 5,1 \)
  • \( 8 + 2,6 = 10,6 \)
  • \( 4,7 + 16 = 20,7 \)
  • \( 2,58 + 1,4 = 3,98 \)

в)

  • \( 4,2 + 15,68 = 19,88 \)
  • \( 0,906 + 12,8 = 13,706 \)
  • \( 0,47 + 9,441 = 9,911 \)
  • \( 2,3 + 0,044 = 2,344 \)
  • \( 1,0008 + 34 = 35,0008 \)

г)

  • \( \frac{2}{3} + \frac{5}{8} = \frac{16 + 15}{24} = \frac{31}{24} = 1\frac{7}{24} \)
  • \( \frac{4}{15} + \frac{7}{12} = \frac{16 + 35}{60} = \frac{51}{60} = \frac{17}{20} \)
  • \( 3\frac{13}{15} + 6\frac{7}{10} = 9 + \frac{26 + 21}{30} = 9 + \frac{47}{30} = 9 + 1\frac{17}{30} = 10\frac{17}{30} \)
  • \( 9\frac{8}{21} + 4\frac{11}{14} = 13 + \frac{16 + 33}{42} = 13 + \frac{49}{42} = 13 + 1\frac{7}{42} = 14\frac{1}{6} \)